Search using 
Waterheatertimer on Twitter
Polaris 34 and 50 gallon condensing heaters
|
Search using
Waterheatertimer on Twitter |
Review Polaris water heater Polaris 34 and 50 gallon condensing heaters |
  Larger imageLarger image Another image Polaris is in a class of heaters called 'condensing water heaters' due to the high efficiency design of the heater ... where a large propane or natural gas burner produces hot combustion gasses that are recycled through an helical shaped heat-exchanger located inside tank ... resulting in large output of hot water, rapid recovery ... and a flow of condensed acidic water vapor that must be routed into floor drain. Polaris is a Power Direct Vent condensing heater. Condensing heaters are either Power Direct Vent (incoming air supply comes from outdoors, and vent terminates outdoors)., or Power Vent (incoming air supply comes from inside room, and combustion vent pipe terminates outdoors). Not all power vent and power direct vent heaters are condensing heaters. Condensing heaters: Since the DOE 2015 energy standard, any household requiring residential-grade* gas water heater larger than 50 gallon, must reduce consumption, convert to solar, look to buying two heaters, or buy a high-efficiency condensing heater ... *or household can buy large and less-efficient, high-output, non-condensing 74-98 gallon water heaters. Example spec sheet Choices are further regulated in states that require Ultra Low NOx heater to reduce the release of NOx greenhouse gas. This requirement is not universal across all states in 2019. Condensing heaters are required to be Ultra Low Nox by government standard because of the large BTU consumption ... while other commercial grade and commercial grade for residential heaters might NOT be low NOx or ultra low NOx, depending on BTU output and specifications of unit. Resource: Two water heaters Polaris ultra low nox, high efficiency (Polaris 80.5% efficiency) power direct vent water heater with long-lasting corrosion resistant 444 stainless steel tank and 'precise temperature control' is available in 34 and 50 gallon residential and commercial 100,000 to 199,000 BTU models that are designed to meet market for high-demand hot water usage. Cannot be exposed to more than 7-12 grains water hardness. Does not require anode rod. Polaris will supply large quantities of potable (drinkable) hot water as a stand-alone unit for commercial applications, apartment, or high water usage residential household ... or can be connected to auxiliary storage tank, or used with household air handler for space heating in large or small homes and apartments. Polaris has residential and commercial models. Both are identical except for model numbers and coloration. Both have been in use many years, and both available for propane or natural gas. Resource: Polaris residential and commercial spec sheets/pdf  Polaris
residential model is rated 'commercial grade residential
heater,' with 10-year limited tank, and 1 year parts warranty for
residential
installations.The Commercial model is rated 'light-duty commercial,' with 3 year tank and 1 year part warranty. Commercial heaters usually have shorter warranties, often operating more frequently, and set to higher temperatures that cause more strain on tank. The heater wears out sooner. Polaris 100,000-300,000 BTU per hour fuel consumption exceeds fuel consumption of typical 30-40,000 BTU residential heaters, yet Polaris is nearly same size. For example, 50 gallon Polaris is 63-3/4"x22", which is comparable size with residential tank*, but the 50 gallon Polaris can deliver 170+ gallon first hour, with recovery 165-325+ gallons per hour... meaning Polaris can supply 170 gallons hot water in a single steady draw before water temperature becomes unusable (depending on temperature rise, which is thermostat setting minus incoming cold water temps) Resource: Recovery chart from pg 9 manual/ .pdf Contrast with ordinary 50 gallon, 40,000 BTU residential tank used by a family of 3-4 people will deliver 70-80 gallons of usable hot water in a single steady draw, with recovery about 42-50 gph (gallon per hour depending on BTU rating of heater, thermostat setting, incoming water temperature, condition of heater, etc) *Typical residential
tanks might be wider due to 2015 energy standards
Resources: Polaris specification sheet Polaris commercial specification sheet/ pdf Installation manual applies to commercial and residential Water heater terminology & formulas/ pdf |
 Polaris user interface (image photoshopped for clarity/ resource image/ 34 gallon/ ) Polaris has LCD readout with ''electronic controls that give homeowners precise temperature control and advanced water heater diagnostics through a large, easy-to-use touchscreen display.'' The LCD control or UIM user interface module is located on front face of unit. The UIM interfaces with the CCB (central control board) "at bottom of heater located inside protected enclosure." Polaris water heaters "are equipped with an enable/disable circuit for use with field supplied external supervisory controls such as time clocks or Building Management Systems." Resource: read section in manual |
Condensing water heaters cycle
combustion gas through heat exchanger Polaris
is among a group of high efficiency, high consumption commercial and
residential heaters that are classified as condensing.For example, AO Smith also manufactures the high-efficiency Cyclone series 'commercial-grade' condensing heater with 3 year warranty and two power anode rods, and the lighter-duty, less expensive, 'commercial grade for residential,' high-efficiency Vertex with 6 year warranty and two heavy duty anode rods among other differences with Polaris. Resources: Vertex specification sheet .pdf Example Cyclone spec sheet.pdf Anode rods protect tank from rusting. The 444 stainless steel Polaris doesn't require anode rods. Resource: How to replace anode rod As a group, condensing heaters achieve higher efficiencies (80% efficient) than typical power vented and atmospheric heaters (60% efficient) found in most residences by recycling hot combustion gasses though helical-shaped heat exchanger coil before venting gas out of heater. Less heat is wasted up the vent pipe. How it works: Improved and 'ultra-quiet' Polaris blower motor draws air into the burner at the bottom of the water heater through air inlet pipe from outdoors. The supply of propane or natural gas fuel is mixed with air inside the burner located at lowest part of the 444 corrosion resistant stainless steel tank. After burning the fuel, the blower recycles hot combustion by-product through the helical heat exchanger made of 444 corrosion resistant stainless steel, before pushing the by-product out of the tank near bottom of heater and then upward through vent pipes that exhaust outside via side-wall or rooftop vent terminations. Vent pipe is typical approved 2-3" PVC, CPVC or Polypropylene (solid core only) as per specs shown in installation manual. Resource: Polaris manual According to promotional literature, the thermal efficiency of condensing heaters with the heat exchanger reaches 94-96%. The manual claims that the vent pipe at bottom of heater is not hot to touch. (Thermal efficiency is not same as overall efficiency ... Thermal efficiency is a measure of combustion heat that is transferred into the water .... while overall efficiency includes thermal efficiency, standby loss, and energy consumption of blower).. 94-96% thermal efficiency means the heat that is produced by the 100,000-199,000 BTU burners found in condensing heaters is almost completely recycled into the water, and only 4-6% of heat is wasted up flue pipe. Contrast with ordinary residential heater where '25-30%' of combustion heat is lost up flue pipe. High efficiency/ high cost Condensing heaters have high efficiencies, less heat wasted up flue pipe, and produce plentiful hot water, but there is trade off for choosing condensing. The trade off is condensing heaters cost more to buy, require more maintenance and repair, repairs are generally not DIY by homeowner or local handyman, they require very specific installation and larger gas line. For the normal household with 4-6 people, a condensing heater might not save money vrs downsizing to a smaller tank or using two heaters. On the other side, buying a heater that is too small for the job will overwork the small heater ... causing more moisture, more expansion-contraction of tank, increase maintenance and repairs, and shorten lifespan of unit. Resource: Two water heaters |
| Condensing heaters and
environmental impact: NOx and acidic water vapor Burning hydrocarbon fuels releases CO, SO, CO2, NOx, acidic water vapor etc into atmosphere.... puffing out of every vent stack and tailpipe across the globe, poisoning the planet. The Polaris has massive burner and releases massive amounts of poison. Converting to solar heated water like most the world, or installing smaller tank and reducing consumption are the only answers. NOx: The Polaris heater offsets some environmental effects by having a ultra low nox burner .. reducing NOx to 14 ng/J (nanogram per joule of heat output) or 20 PPM (parts per million), meeting California standards for heaters over 75,000 BTU. Low Nox burner keeps combustion temperature below NOx or nitrous oxide formation threshold ... or 'eliminates conditions that cause formation of NOx' ... "when flame temperatures reach high enough level to “break” the covalent N2 (nitrogen) bond apart, allowing the “free” nitrogen atoms to bond with oxygen to form NOx." Residential Ultra Lo NOx water heaters are available that are rated 14 PPM ... slightly better than 20 PPM for Polaris.
Residential Ultra Low NOx water heaters cost more to manufacture than ordinary residential heaters, cost more to buy, possibly more to repair, with result that low NOx heaters are generally sold in states that mandate Ultra Low NOx, while other states lag behind. The landscape is changing fast, as more people demand a response to environmental change. Residential water heaters without the ultra low NOx burner, that are manufactured with typical 'pancake burner,' are most common type of heater .... they cost less, are easier to manufacture and repair, but 'almost always have some zones operating at or above peak NOx formation' .... releasing estimated 54 PPM NOx .... 3.8 x more NOx per BTU than ultra low nox residential heaters ... and 2.7 times more NOx than Polaris per BTU. Polaris 100,000 BTU per hour burner
will release about 54 ppm NOx after 1 hour of continuous operation, which is same
NOx as 40,000 BTU residential heater with pancake burner will release
in one hour of continuous operation.
Polaris with 199,000 BTU per hour burner, will release twice as much NOx per hour of operation as 40,000 BTU residential heater. Resources: Basic water heater parts NOx formation in water heaters/pdf CO2: CO2 is unregulated and can be unlimited on all gas water heaters. Convert to passive solar like most of world's population, and reduce consumption.   Acidic
water vapor: (reference acid rain / power plant history)Condensing heaters are possibly less destructive than ordinary atmospheric heaters because they reduce amount of acidic water vapor released into atmosphere ... albeit the acidic water goes down a drain and enters water supply anyway. When hot gasses are pushed through the helical heat exchanger of a condensing heater, the gas cools, causing acidic water vapor to condense out. The acidic water is continually drained out of heater at bottom of vent pipe though a special exhaust elbow that drains condensate water but prevents release of toxic gasses. Resource: Venting instruction supplement If the condensate drain is blocked on Polaris and other condensing heaters, water will accumulate inside vent causing back pressure. Polaris has two pressure switches. One that monitors incoming air supply (blocked intake switch), and one that monitors flow of air into the vent (blocked outlet switch). If water is obstructing the vent, the blocked outlet switch switch locks out heater until drain is opened. |
 Power requirementMust be directly plugged into 120 volt 3-prong single phase outlet/ 15 or 20 amp breaker. Voltage must be steady and cannot fluctuate. Cannot use extension cord. Extension cords, plug-in monitors, surge modules, plug-in wifi controls do not provide 100% reliable connection. Clean, uninterrupted power is needed, especially with an inductive motor load (blower) that draws a brief surge of amps at same time the water heater's electronic control is tightly monitoring the sequence of events prior to igniting fuel. Interruption of power will cause shut down. Three failed attempts cause lock out. Unplug unit to reset control system. Blower and heater operation draw less than 7 amps x 120 volt = 1400 watts.  Outlet must be grounded for the heater to operate without error. Outlet must have correct polarity. All water heaters that plug into outlets are polarity sensitive. Use circuit analyzer to check outlet. Polaris will not operate if polarity is reversed ... 'the water heater control system will declare a fault condition and lock out.'  Line noise and surge from other motor loads and
appliances on same circuit can cause errors and failures.Recommend dedicated circuit where breaker supplies power to water heater and no other load. "EM I electro magnetic interference or RF I radio frequency interference may cause erratic control system and malfunction." Surge protection is recommended for all electronic devices including Polaris water heater. A surge protection outlet is recommended vs a plug-in surge module ... surge outlet is correct choice for reliable electrical connection. Buy: Surge outlet Circuits can have multiple surge protection devices. The closer the surge protection is located to the electronics, the better it protects. No amount of surge protection can protect from direct lightning strike. Simple power outage and power resumption can destroy electronics. Additional action can include unplugging heater and use disable switch at bottom of heater during power outage or severe lightning storm. Do not use GFCI, it can cause malfunctions, it is not necessary and not required by code. GFCI can interfere with operation of all power vented, and flue dampered water heaters, both residential and commercial. |
| Gas pressure "Cannot exceed 14 WC Minimum 3.5 WC Gas pressure must be stable within 1.5 WC  All
models - Maximum Supply Pressure: 14 inches W.C. (3.48kPa)Over 14 WC requires regulator Minimum Supply Pressure for Natural Gas: 3.50” (.87kPa) Minimum Supply Pressure for Propane Gas: 8.00” (1.99kPa) Minimum pressure must be maintained under both load and no load (dynamic and static) conditions." Gas line Use only black pipe. Keep ends of pipe clean, do not let shavings, connection compound, dirt, or teflon tape enter gas valve. Do not use flexible gas line with high volume gas appliances. Bends and uneven pipe can restrict gas flow. Never use galvanized pipe ... is reactive with gas and flakes of galvanized will enter gas valve requiring replacement. Example "Input 199,000 BTUH .... Total pipe length, 80 feet = 1" IPS required. Example Input 199,000 BTUH ... Total pipe length, 50 feet = 7/8" IPS required. Resource: Gas pipe capacity chart Gas input rate is affected by environmental factors such as: • Heating value of gas • Air and gas densities (vary due to barometric, pressure, temperature changes) • Venting installations (pipe diameter, length and fittings) • Altitude |
 Sequence of operation: older
versionApply power and Green LED is on. Thermostat sensor (thermistor) detects low temperature and calls for heat. Yellow LED on. Blower prepurge 6 seconds.. Hot surface Igniter warms up 35 seconds. Blower turns on. Gas valve open, gas flows to burner. Red LED on. Main burner ignition. Flame sensor confirms ignition. Unit operates until thermostat set point is reached. Blower post-purge clears flue gas. Resources: Older installation manual Older troubleshooting guide Older service manual Sequence of operation: newer version '-Control system detects water temperature is below programmed set point. -Heating cycle activated. -Control system runs diagnostic checks. -Control system confirms exhaust and intake and ECO contacts are closed (ON) -Blower turns on for pre-purge -Spark ignition transformer is energized. -Hot surface igniter glows red hot. -24 volt gas control valve opens, and gas flows to main burner. -Control system monitors flame sensor to determine if gas has been ignited. -If flame is detected, control system enters heating mode. -When control system detects tank has heated to thermostat set point. -24 volt gas control valve is de-energized. -Gas stops flowing to burner. -Spark ignition transformer remains on to ignite any remaining gas, then turns off igniter. -Blower continues to run 60 seconds until end of post-purge cycle, then coasts to a stop. -Control system goes into standby mode while continuing to monitor water temperature and state of other system devices.' Resources: New installation manual resident all New installation manual commercial model Specification sheet Faults , errors, alerts, and problems When problem is detected, control system issues fault messages on LCD display, and locks out operation of heater. Lock outs can be reset using the enable-disable switch located at bottom of heater. If fault is still present, then lock out will continue. Other issues will cause Alert condition, and water heater will continue to operate. Service manual? No service manual available for newer version of heater. Installation manual says ''Only qualified service technician, as defined in Qualifications using appropriate test equipment, should perform any service procedures on the water heater.'' Since other highly technical AO Smith water heaters have service manuals, one has to wonder why Polaris is different. Resource: Polaris troubleshoot guide Older service manual |
 Thermal efficiency Polaris does not have 94-96% energy efficiency. - 94-96% thermal efficiency refers to the amount of heat that is recycled into the water via the heat exchanger instead of venting out flue pipe. The manual claims the vent pipe leaving bottom of tank is not hot to touch because of the thermal efficiency. True Efficiency EF or UEF is the combined thermal efficiency, power use, and standby efficiency of water heater. Polaris has UEF (Uniform energy factor) 88-90 or less, which includes thermal efficiency plus standby loss for total energy consumption including blower motor. UEF is a formula that must subtract a small percentage of tank volume ... for Polaris that translates to 80-86% efficiency for 34 gallon and less efficiency for larger 50 gallon size Polaris. This is good when compared to .60 efficiency for regular 50 gallon tank heater. Polaris is rated as 'commercial grade residential heater' to sidestep the full rigors of 2015 energy standards that apply to 'residential' water heaters. Resource: How much does it cost to run gas water heater |
 Power direct ventAir intake and venting through sidewall or rooftop via approved 2-3" PVC, CPVC or Polypropylene (solid core only). Operates similar to other power vent water heaters. Has electronic ignition, or spark ignition system ... commonly called hot surface igniter, or flame rod, that glows red hot and stays on throughout heat cycle to continuously ignite fuel.... no pilot flame. Condensate drain required. Household drain cannot be made of metal or other material that is reactive to acidic water. Condensate trap might be required on incoming air supply in some circumstances when cold climates create condensation inside intake pipe as cold air inside pipe is warmed by indoor temperatures. "The vent and intake air piping (direct vent installations) may not be combined with any other appliances under any conditions." In other words, the vent cannot be passively vented up a chimney, or shared with furnace, another water heater or gas appliance as commonly found with some water heater installations. Vent must be installed according to manual, using correct size and type of materials that do not violate maximum distances, slopes, number and types of elbows etc as instructed in manual. Power vented water heaters meet LEED standards for home efficiency since power direct venting allows the home to be sealed, or insulated tighter without requiring air penetration to support water heater draft. Maximize the efficiency by keeping mechanical room sealed in winter, and ventilated in summer. Locate heater close to usage points. Resource: Add vent fan to boiler or any power vented water heater Venting instruction supplement |
 For potable
(drinkable) hot waterFor commercial application, apartment, or high usage household. Add heat trap to improve overall efficiency. Stops upward heat loss through pipes. Tempering valve or mixing valve will automatically add cold water to household water supply so Polaris thermostat can be set to 160° to maximize space heating via air handler, and keep household water below dangerous levels. For the mixing valve to work properly and avoid bubbles in water line, the pipe leaving mixing valve must travel vertically Resource: Advantages tempering/ mixing valve Pressure reducing valve required if incoming water pressure exceeds 80psi. 50 psi is ideal. Resource: Pressure reducing valve Expansion tank required if incoming cold water line has pressure reducing valve or check valve. Or if required by local code. Resources: Expansion tank Check valve Thermal expansion: closed system TP valve code |
 For potable hot water and space
heating Can be integrated with air handler for space heating. ''With up to 199,000 BTU, the Polaris unit can easily heat a large or small home by circulating hot water through coil in air handler.'' The air handler blows air across the coil before circulating warmed air through household ducts. According to manual, Polaris is 'not designed as primary heater for space heating.' Primary purpose is to produce hot water for household usage. Polaris cannot take the place of a boiler. A boiler produces 200° water (Polaris heats to 160°). Boiler requires chemicals in the boiler water to inhibit reaction with metal pipes etc. Polaris cannot be exposed to boiler chemicals. Same chemicals can never be allowed into potable (drinkable) water used inside home or business. "Polaris comes with 1” NPT recirculation loop return connections located on side of tank. When air handler calls for heat, the circulating pump draws hot water out of Polaris and circulates through heat exchanger coil located inside air handler. Use separate 120 VAC power for circulating pump. Do not draw power from Polaris circuit ... can cause electrical line noise and erratic control of heater." "• Do not use Polaris with piping that has been treated with chromates, boiler seal or other chemicals and do not add any chemicals to the water heater piping. • If the space heating system requires water temperatures in excess of 120°F, a mixing valve must be installed per the manufacturer’s instructions in the potable hot water supply to limit risk of scald injury. • Pumps, valves, piping and fittings must be compatible with potable water. • A flow control valve (check valve) is required on pipe carrying hot water to air handler to prevent thermosiphoning." Typical swing check valve allows water to flow one direction inside the pipe, but not the other direction, and must be installed in horizontal position to function correctly. "Thermosiphoning is the result of a continuous flow of water through the air handler circuit during the water heater off cycle. Weeping (blow off) of the temperature-pressure relief valve (T & P relief valve) or higher than normal water temperatures are the first signs of thermosiphoning." |
 Control
temperaturesPolaris factory setting is 120°F. 'The “Operating Set Point” for polaris is adjustable from 90°F (32°C) to 160°F (71°C) using the LCD control. Commercial models: 90°F (32°C) to 181°F (83°C) Both commercial and residential models: ECO (energy cut off located in thermostat probe) opens (locks out heater) when water temperature inside tank reaches 202°. The LCD control gives error message. ECO can be reset at 140°F by turning off power and re-powering unit to reset control unit. ECO trip indicates serious malfunction.  Enable-disable switch There is a Enable/Disable switch located at bottom of heater that can be set without removing access panel ... must be set to enable for operation. In emergency, unplug water heater from power and set switch to disable. Polaris factory setting is 120°F. Typical bath shower is 104°-108°F. "Maximize efficiency by setting to minimum temperature that supplies acceptable hot water supply." Higher operating temperatures cause more wear on all water heaters and will decrease the life span of the water heater by creating more strain on tank walls, more moisture, and wear-n-tear with constant use. Add booster heater if very high temps are required. The newer Polaris is "equipped with electronic control system to regulate water temperature. The control system senses temperature from two factory installed temperature probes (thermistors), one installed in the top of the storage tank and one installed near the bottom. Any temperature setting over 120° requires mixing valve or tempering valve to temper or cool water to 120 or less before entering household plumbing. High temperatures can kill and permanently injure. For the mixing valve to work properly and avoid bubbles in water line, the pipe leaving mixing valve must travel vertically. Add air vent if needed Resource: Air vent  Danger from high temperatures160° can cause serious injury almost instantly, and is not recommended except when air handler is part of system ... or if unit is operated intermittently to produce batches of hot water that are sipped throughout the day ... a useful strategy if gas pressure or supply is having problems or line is too small to supply all gas appliances, and/or other gas appliances are starved for fuel when Polaris is operating ... using Polaris as a batch storage tank reduces first hour delivery equal to ordinary residential tank, around 70+% of tank volume ... up-size gas meter is one strategy ... but no matter what the reason for 160° thermostat setting, the risk of very high temperatures necessitate mixing valve. Resource: Advantages tempering/ mixing valve Absolutely ... 180°F scald is potential fatal injury. The commercial version Polaris has max thermostat setting 181°F.  Rooftop
solar collection systems can reach 180°F.Boilers can produce 200°F water. These 180-200° temps should never be introduced into the water lines that supply user taps. A tempering valve or mixing valve is required for any temperature above 120°F. Advantages disadvantages mixing valve Higher temperatures distill more chemicals out of water resulting in more maintenance, cause higher pressures that strain tank and pipes, create more risk, and shorten life of heater. Most commercial water heaters, and all residential heaters operate within 90-160° range, largely because of danger, and uncommon need for higher temperatures. |
  |
 Resources new version: AO Smith, American, State, Lochinvar, etc Polaris-parts-sheet-2019 Polaris parts sheet 2 -2019 Residential Polaris-installation-manual.pdf Commercial installation-manual-2.pdf Polaris-commercial-spec-sheet.pdf Polaris-residential specification-sheet-6.pdf Residential-and-commercial-spec-sheets.pdf AO_Smith-polaris-33.pdf Polaris-troubleshoot-manual.pdf Older version Lennox-Polaris-installation-manual.pdf Older version/ replacement parts/ pdf Polaris®-Troubleshooting-guide.pdf Polaris-service-manual.pdf Lennox polaris heating system sell sheet |
 Design change over timeThe older version, and newer version are same in many ways and differ in others. AO Smith, American, Lochinvar, State all sell same updated version today. Same design Size: both old and new are identical according to specification charts. This means identical height, diameter, weight, BTU rating, insulation etc. Exception: the older version offered 100 gallon 199,000 BTU unit, while newer version only has 34 and 50 gallon sizes, but not 100 gallon. Resource: Polaris old and new specification chart Overall purpose is same: to efficiently supply high volume of potable hot water, with secondary purpose of supplying hot to auxiliary tank ... and/or space heating home/ apartment. Internal heat exchanger, tank, water heating capacity, etc are same/ similar. Plumbing connections might have different orientation, but remain same. Both have corrosion-resistant stainless steel heat exchanger and tank, and do not require anode rod. Both have hot surface ignition (no pilot light). Both require same standard pipe size for BTU: Locating heater is same: .... within few feet of 120 volt dedicated outlet, next to floor drain. Both must be plugged directly (no extension cord) into 120 volt single-phase outlet. Dedicated circuit recommended. Power consumption 7 amp max, or 7 amps x 120 volts = 1400 watts. Locate where blower noise will not be objectionable. Locate so water heater can be vented properly. Install vent terminations where noise will not be objectionable and exhaust cannot be sucked back into home. Differences: Newer model has redesigned blower motor for less noise ... or 'whisper quiet' as claimed in promotional literature.  Venting
and air supply requirements can be different.AO Smith manual says: ''When replacing existing (older) Polaris unit, it is recommended that the venting system be reviewed for compliance with the requirements contained in the new instruction manual.'' Installation manual -Improper air intake and vent will cause negative and positive pressures that will open pressure switch circuits and cycle water heater off. -When installing or changing air intake pipes, care must be taken to make sure no plastic shavings can enter water heater. "Plastic debris left on intake air pipe sections can collect inside and clog the burner and lead to rough operation and/or ignition failure." -"Using smaller pipe size than required or installing more elbows on the air intake and vent pipe can cause a fault condition and lock out." Thermostat: older unit had hand adjustable thermostat knob, with single temperature sensor ... a 10K ohm at 77°F (25°C) thermistor located in mid upper part of tank. Newer units have LCD temperature control and 2 temperature probes, located at bottom and mid upper parts of tank. The control system on new AO Smith version has been modernized with more electronics, and completely different wiring and control interface. Older style heater had "self-diagnostic control automatically monitoring all critical functions which indicated status of all functions using flash code sequence." Newer Polaris has LCD readout with ''electronic controls that give homeowners precise temperature control and advanced water heater diagnostics through a large, easy-to-use touchscreen display.'' Parts are not interchangeable between older and new models. Older parts sheet Newer parts sheet |
| "A water heater is an appliance for supplying hot water
for residential or commercial use other than space heating. The maximum outlet water temperature for any water heater is 210°F ( 98.5°C)." Resource: Designing energy efficient commercial systems .pdf |
 |
Buy Electronic parts Industrial supplies Tools and home improvement Home and garden Hayward pool Pentair pool Southwire electric |
 |
Buy
Tools DEWALT Black and Decker Stanley SKIL Makita Porter-Cable Bosch Irwin Hand tools Klein hand tools Fluke electrical testing Dremel hobby tools Campbell Hausfeld air powered Tekton automotive Powerbuilt automotive Saws and saw blades |
 |
Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
 |
Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts Enclosures |
 |
Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
 |
Recirculation systems |
 |
Enter Amazon from
my links Amazon E-mail: geno03245w@gmail.com My response might end up in spam folder, check email folders Waterheatertimer on Twitter |
