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How to install point of use water heater/ strategy for downsizing main water heaterBuy:Under counter water heaters at Amazon Point of use water heaters at Amazon Under-counter/ point-of-use water heaters shown here are electric What size do you need? If you need to run out 1 gallon before getting hot water, then use 3 gallon under-counter |
120V hardwire or use 12-3 extension cord
3/4" connections2 to 20 gallonsSame-day repair; using generic parts (except marathon)Repairable by homeowner |
 Reliance 6-10 gallon Side connections/ 6 year warranty Buy Reliance water heaters 12-3 extension cords 12-3 southwire cable Resources Reliance manual State manual |
 American 6-12 gal Top connections/ 6 year warranty Buy American tiny at Amazon 12-3 extension cords 12-3 southwire cable Resource: American manual |
 Rheem 2-6-10-20 gallon Side connections/ 6 year warranty Buy Rheem point of use 12-3 extension cords 12-3 southwire cable Resource: Rheem manual |
 Buy: Holdrite at Amazon Steel pegboard Hyloft storage hardware Garage storage Resource; How to use 20 gallon water heater for tankless recirculation |
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Plug into 120V 3-prong outlet
Temperature control on front2.5 - 6 gallonNon-generic partsRepairable |
 Ariston / Bosch 2.5 - 4 gallon - 7 gallon Top connections/ 2 year warranty Buy Ariston at Amazon Bosch at Amazon Resources Ariston resources Bosch P10 P5 |
 State / Reliance American/ are all AO Smith 2.5 - 6 gallon Top connections/ 6 year warranty Buy American 2.5 Amazon Reliance 6 gal Amazon Resource: Reliance manual |
 Waiela 2.5 - 4 gallon Top connections 6 year tank warranty Buy Waiwela at Amazon Resource: Waiwela mini tank |
 Eemax 1.3 - 2.5 - 4 - 6 gallon 6 year tank warranty Buy Eemax water heaters Chronomite 2.5 gallon Resource: Eemax manual/ parts |
 Stiebel Etron 2.5 - 4 gallon Top connections 2 year warranty Buy: Stiebel Eltron water heater Resource Steible 2.5 manual |
Tankless120-240V hardwire30 amp 10 gauge wire Must be dedicated circuit with no other load on breaker  Some
repairs possibleTankless units are always connected to incoming cold water line. Tank-type heaters shown above are connected to either hot or cold incoming water. How to wire tankless electric |
 Atmor 2 year parts-7 year leak warranty 120-240 volt models Buy at Amazon 120 Volt 30 amp Amazon Resource: Atmor Installation manual |
 Hardwire 120 Volt 7" x 11" x 3" Buy Eemax SP3512 120V 3500 watt/ 30-40 amp Eemax SP35 240Volt Resource Eemax tankless manual Sell sheet with wire size chart Troubleshoot |
 Ecosmart Tankless Hardwire 120 Volt 7" x 11" x 3" .25 gpm Buy Ecosmart water heater 3500 watt/ 30-40 amp 6000 watt/ 30-40 amp 18,000 watt/two 40 amp Resource: Ecosmart manual Ecosmart troubleshoot How to wire tankless electric |
 Tankless Hardwire 120 Volt Buy Stieble mini 120V Amazon 3000 watt 30 amp Stieble mini 6 240 Volt 5700 watt 30 amp Stieble DHC 3-1 120 Volt 300 watt 30 amp Stieble DHC 6-2 240 Volt 6000 watt 30 amp Resource: Steible Eltron mini manual Stieble DCH manual |
 Hardwire 120 and 240V models Buy at Amazon Chronomite water heater Resource: Chronomite manual Buy Bosch 3.4 120V 3400 watt/ 30 amp Bosch 9.5 240 Volt 9500 watt/ 40 amp Resource: Bosch powerstar manual |
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1) What size water heater?1:3 rule of thumb:If 1 gallon runs out before hot water arrives, then 3 gallon water heater is correct size. Before choosing: Look at Hot-cold Options below. Buy under counter water heater: Under counter water heaters at Amazon Point of use water heaters at Amazon |
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economy Buy water heater my affiliate link: Under counter water heaters from Amazon :Point of use water heaters at Amazon |
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2) Pay attention to Hot and Cold inletsIf inlets are reversed, tank will not perform as expected.Source of water must connect to Cold inlet on water heater |
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What if... no drain valve on tank?Install drain valve on cold water inletInstall shut-off on cold water line No drain valve on water heater? Remove TP valve and siphon water from tank |
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 a) Spend more for more hot water. b) Spend less for less hot water Buy: Chrome shut off valves at Amazon |
3) Connect water heater to hot or cold?a: Connect to Hot source. See imageCosts more: This draws hot water from main water heater so after under counter tank gets cool, more hot water arrives from main tank and hot temperature stays about same. Advantage option 1: Plenty of Hot water, but all costs are energy. Problem with option 1: Costs more. Each time small amount of hot is drawn from faucet, equal amount of cold water immediately enters main water heater. This causes the main water heater to operate more. b: Connect to Cold source. See image When using under-counter water heater for hand-washing, this is best option Problem with option 2: Hot water supply is limited to amount of hot water in under counter tank Advantage with option 2: Costs less. Each time hot is drawn from faucet, cold water does not enter main water heater. |
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Basic connection Shut off recommended between water source and water heater Use gate valve or ball valve Buy: Lead-free ball valve at Amazon Chrome shut off valves at Amazon |
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 Buy: Pot heaters at Amazon |
Other options?Yes:a) Use pot heater b) DIY solar: Set 2 gallons water outside in sun each day c) Recirculation system
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4) Do not drop water heateror damage can occur to tank and parts.Check elements-and-wiring and water heater should work Do not call the manufacturer and report problem, or warranty could be compromised. E-mail question: geno03245w@gmail.com My response might end up in spam folder, so check e-mail folders Resources Post question on pro water heater forum How to troubleshoot electric water heater |
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5) Earthquake strapsElectric water heaters can be set on wood surface or carper without specific dangerCover all electrical outlets and connections with approve plate, and keep cover(s) on side of tank to protect from electrical short causing fire. Overflow tube and water leaks can cause water damage Buy: Earthquake straps at Amazon Resources See earthquake strap illustration Earthquake map |
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 Use di-electric nipples |
6) Use di-electric nipples... if connections are 3/4"Avoid electrolitic deterioration of pipes and water heater by using di-electric nipples when connecting water heaters. Available in water heater department. Use teflon tape on threads. Some under-counter heaters come with pre-installed nipples and connections. Use connections that are supplied. Pre-installed heat-trap nipples clog easily if house has pressure problems, or hard water. Consider replacing heat-trap nipples if pre-installed. Buy: Dielectric nipples at Amazon Resources Read about low hot water pressure 9-ways to save with water heater How to remove short water heater nipple |
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Solder copper pipesMost under-counter 6 gallon and 12 gallon water heaters have 1/2" connections. Best practice is to avoid soldering directly to water heater. First, solder piece of pipe to male or female adapter, and then attach adapter to water heater. This will avoid direct torch heat on water heater. Resources How to solder copper pipes |
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 Drip pan |
7) Drip pan saves damageDrip pan saves damageResource: See drip pan installation Buy: Water heater drip pans at Amazon Buy: Water detectors at Amazon Auto-shut-off valve at Amazon |
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 Tank must be full of water |
9) Tank MUST be full of waterElement will instantly burn out if tank is not full of water.Fill tank completely until faucet is running full stream THEN open TP valve momentarily to release last of air from top of tank. Once tank is full of water, power can be turned ON. Resources How to test element |
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10) Insulate tank and pipesDo NOT block TP valve leverElectric water heater can be totally covered with insulation except TP valve |
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Example
#1 finished install Showing optional ports available on various models Showing drain pan and TP overflow tube Must be 6" between TP overflow tube and floor drain. Or overflow tube can be directed outdoors Make sure drain valve is installed |
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Example
#2 finished install Showing 120volt plug and outlet for some models Do not use extension cord. Outlet must have correct polarity and be grounded Check outlet with circuit analyzer from hardware store. Resources See circuit analyzer Also use wiring information shown below |
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Example
#3 finished install Showing 6" heat trap pipe configuration on hot water outlet. Showing drain valve installed on cold water inlet Showing location of anode rod Resources How to replace anode rod |
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Electricity
to Under
counter water heater |
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 Buy: Dishwashers at Amazon |
How
to wire under counter water heater to 15 or 20 amp line that goes to
dishwasher. Objective 1: Either the dishwasher has power or the under-counter water heater has power. But neither at same time. Objective 2: inexpensive, reliable solution that doesn't require much space and is simple to wire, simple to program and handles job with no chance for error.  |
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 I used 14 gauge wire since circuit breaker was rated 15 amp. |
Example
wiring: 1) Buy plastic box with 3/4 Knockout. 2) Use 3/4" male adapter so all 3 wires enter box from same knock-out. 3) Attach timer with self-tapping screws. 4) Remove timer from box to connect terminal ends to timer 5) In this illustration, I trimmed the ground wires shorter and re-applied wire connector so all wires could fit into box before putting cover over box. 6) Attach box next to water heater. Make box accessible so times can be changed. Timer must be re-set to current time after power outage. |
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 LOOK for numbering on back of timer module. Terminals #1 and 2 are for clock motor |
What
are NO NC connections? They are like a 2-pole light
switch. When one is OFF, the other is ON. And they are never ON at same
time. With NO NC connections, either the dishwasher has power or the under-counter water heater has power. But neither at same time. Choose convenient times to run either appliance. For example after lunch you want to operate dishwasher, but no longer need water heater. And then water heater can remain OFF until shortly before before next meal. This is possible using FM1 Intermatic timer shown below. |
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Set pins on 24-hour dial. Move pins in or out to set on-off times.
15 minute
intervals. How to set timers 2) NO NC terminals mean water heater and dishwasher can never be ON at same time. 3) 21 Amp capacity meets project specifications. 21 x 80% = 16.8 amps. Handles 12 amp water heater or 11 amp dishwasher. 4) Mount timer inside square plastic box available from home center. Deeper box is better. Put cover over top when finished. 
Project material cost $45  |
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| Alternate timer choice: T1975 timer | |||||||||
 Large image of 120Volt T1975 |
T1975
timer with NO and NC terminals 20 amp rating Each tripper: 15 minute intervals. 4 consecutive trippers = 1 hour. If you want dishwasher circuit available from 7 to 10 PM, install twelve consecutive trippers starting at 7pm and ending at 10pm. Remaining hours of the day, the water heater is ON. Resource: How to wire T1905 and T1975 Alternate timer with same wiring T1905 Buy timer: T1905 series 120Volt 20 amp 1 Hp timer at Amazon  |
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Wiring
diagram
for T1975 Water heater is ON at all times except when timer turns ON. To reverse, so heater is OFF, switch black wires on NO NC terminals Water heater connected to Normally Closed terminal. Dish washer connected to Normally Open terminal When timer activates, water heater turns OFF, and circuit to dish washer is ON. Resource: How to wire T1905 and T1975 Intermatic timers and manuals |
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T2000 7-day timer/ indoor box/ 42-on-off/ 2 hour minimum on-off/ 6 on-off per day/ 20 amp/ SPDT120V and 208-277V42 ON 42 OFF per week Minimum ON-OFF 2 hours 6 ON-OFF per day NO NC terminals SPDT Buy: T2005 120 Volt at Amazon T2006 208-277 volt at Amazon Parts: Replacement 156T1950A trippers at Amazon WG720 120Volt clock motor at Amazon WG723 208-277Volt clock motor Replacement snap switch 133T701A Resources: T2000 sell sheet T2005 Manual T2006 Manual |
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Wiring diagram for T2005Connect 120 Volt water heater as shownAdd dishwasher: Connect dishwasher black wire to NC terminal. Connect dishwasher neutral wire to other white neutral wires. |
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| Alternate timer choice: GE 15207 From Home
Depot |
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 Wiring diagram for GE 15207 timer How to wire GE 15207 timer to control 240Volt load GE timers and manuals |
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Support
the economy: Buy water heaters from my associate links: 50 gallon Gas water heaters at Amazon 40 gallon gas water heaters at Amazon 50 gallon Electric water heaters at Amazon 40 gallon electric water heaters at Amazon Hybrid / heat pump/ water heaters at Amazon Resources: How to install gas water heater How to install electric water heater Troubleshoot gas water heater Troubleshoot electric water heater Point of use water heaters |
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Industrial electric at Amazon Industrial supplies at Amazon Industrial and scientific Amazon |
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Tools Shop Amazon - DEWALT Shop Amazon - Black and Decker Shop Amazon - Stanley Tools Shop Amazon - SKIL Tools Shop Amazon - Porter-Cable Tools Shop Amazon - Bosch Tools Shop Amazon saws and saw blades |
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box timers Control water heater w/ Z-wave |
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Control centers: + manuals and parts All control centers and parts Including Z-wave |
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