 Link to: New government water heater standards April 2015 |
How
much does it cost to run water heater/ all costs are energy If it high tech heater costs $400 to repair.... the cost affects monthly bill If water heater is not maintained, it will shorten lifespan and the cost affects monthly bill Home
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Current gas water heater timer on
marketThe Aquanta wifi-controlled gas water heater timer interfaces with the COM port on WV series Honeywell gas valve for atmospheric heaters. It does not interface with power vent Honeywell, but works with power vented heaters by connecting to incoming voltage. This means the Aquanta works with both types of Honewell gas valves Aquanta does not work with mechanical gas valves.  Buy:Aquanta for gas water heaters Aquanta for electric water heaters Resource Aquanta-gas-electric timer-Installation |
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Install meter on Gas water heater Record exact usage of BTU of gas appliances. 3/4" pipe thread connections. Use yellow teflon tape or gas-approved sealant. No excess tape or sealant inside pipe. Use black pipe or yellow flex line. Keep pipes clean during assembly. Install in vertical position with inlets pointing up as illustrated. 12.2" Tall x 8.5" Wide x 11.2" Deep No power source required Digital readout in cubic feet Remote Readable option (pulse output) using EKM-25IDS Buy: EKM gas meter Approved gas pipe sealant Yellow gas line  Resource Gas meter spec sheet with optional remote monitor specs |
| Numbers shown below are based on
efficiency of 30-40-50 gallon water heaters. Efficiency is based on two factors: Fuel consumption, and heat retention during 'stand-by'. Energy factor is not efficiency Energy factor is a formula for calculating efficiency Source for efficiency/ pdf |
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Energy
cost of 1 bath: assumes 60x30x14 insulated bathtub Assumes Temperature rise 60°Summertime incoming water temp 60°, raise to 120° hot water inside tank. Assumes 104° water temperature at bath, 75% to 80% hot-cold ratio. Total 42 gallon bathtub to overflow Displacement 20 gallon for person Total water consumption 20 gallon fairly large person. 16-17 gallon of hot water needed for regular bathtub |
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| Tank
Electric water heater It takes .146666 Kwh to raise 1 gallon 60° .146666 Kwh x 15 gallon = 2.19 Kwh per bath Divide 2.19 Kwh by efficiency rating of water heater (.95), then multiply by cost per Kwh hour you pay. Example 1: typical pre-2015 electric water heater efficiency is 93%: no matter 30-40-50 gallon So 2.16 Kwh ÷ .93 = 2.32 Kwh x 15¢ = cost 34.8¢ per bath Example 2: typical 2015 electric water heater efficiency is 95%: for 30-40-50 gallon So 2.16 Kwh ÷ .95 = 2.27 Kwh x 15¢ = cost 34.1¢ per bath Winter incoming cold water 40° 80° temperature rise .19554 2.93 Kwh ÷ .95 = 3.08 Kwh x 15¢ = 46¢ 46¢ per bath |
Tank gas water heater Example 1: typical 2012 50 gallon gas water heater efficiency .55, and this is generous efficiency for older water heater with dirty combustion parts and build up of sediment on heat transfer surface. Calculation for 2102 50 gallon: 8520 BTU ÷ .55 efficiency = 15490 BTU for 1 bath 15490 BTU x.00001 therm = .15490 therms per bath x .69 per therm = 10.7¢ per bath So 10.7¢ per bath, at sea level, depending on cost of therms. Same calculation for 2012 30 gallon with .58 efficiency = 10.1¢ per bath Example 2: typical water heater manufactured after April 2015, for 50 gallon heater, and let's say new heater still has full efficiency of .60. Calculation for 2015 50 gallon: 8520 BTU ÷ .60 efficiency = 14200 BTU for 1 bath. 14200 BTU x .00001 therm = .14200 therms x .69 per therm = .098¢ or 10¢ per bath. Cost 10¢ per bath, at sea level, depending on cost of therms. Same calculation for 2015 30 gallon with .63 efficiency = 9.3¢ per bath. |
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| Cost of 1 bath: assumes large
walk-in bathtub Assumes Temperature rise 60° Incoming water temp 60°, raise to 120° hot water inside tank Assumes 45 gallon of hot water needed for walk-in bathtub Total water consumption 55 gallon Total Hot consumption 45 gallons  |
Electric water heater Pre 2015 3 times more gallons of Hot needed for oversized vs regular bathtub 1.04 per bath Post 2015 3 times more gallons of Hot needed for oversized vs regular bathtub 1.02 per bath Gas water heater Pre 2015 3 times more gallons of Hot needed for oversized vs regular bathtub 32¢ per oversized bath Post 2015 3 times more gallons of Hot needed for oversized vs regular bathtub 30¢ per oversized bath |
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 How to maintain water heater |
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11. Behavior
that will save money: Maintain
water heater to last twice as long Save $8-10 per month replacement cost If water heater lasts 10 years, and cost $600 to buy and install today, but $1200 to buy and install 10 years from now, then the depreciation cost is $8-10 per month. All costs are energy. Add depreciation cost to monthly energy bill to accurately estimate cost for operating water heater. It makes sense to maintain water heater. Resources: |
| 4 ways to cut energy
cost: Use less hot water, use renewable energy, use cheap and simple DIY products, avoid complex non-DIY products (heat pumps) Avoid promotional literature that promises amazing savings (tankless) Resources Things to increase amount of hot water 9 ways to save with water heater Numbers on this page DO NOT consider maintenance and repair and other factors Numbers do not consider cost of parts, risk of power surge, ease of installation, inconvenience of installation, integration with other sources of energy (solar), ease of maintenance, vulnerability to hard water and water conditions. 1) For example ordinary electric water heater: simple to install, cheap & easy DIY repair using generic parts, service manuals available, can be integrated with timers and solar and geothermal, can be integrated with DC power, can run on any voltage, can be connected to single-phase or 3-phase, can be installed anywhere inside structure including under sink or small closet, can store heat, does not suck air into home, can be easily metered to determine exact cost, no electronics, can be repaired after strong surge, can be fully insulated with a blanket, pipes can be insulated right down to tank, personal belongings can be set against tank, can be maintained to last almost forever, can be exposed hard water and restore full efficiency afterward, can be connected to PV solar or passive solar, can be wired many different ways to meet peak electric pricing, electricity is manufactured at power plant where carbon abatement is localized instead of at each home 2) Contrast with electric heat pump. Differences. Heat pump is large and heavy, makes noise, cannot be repaired DIY, no service manuals, fewer generic parts, must be installed in 10'x10' room and spaces 7" away from wall, requires clean incoming air supply, can affect heat-cooling bill, filter cleaning yearly, requires condensate drain, electronics vulnerable to surge, must be continually connected to power source, using timer can reset water heater to default, must be connected to clean stable 240 Volt, cannot be integrated with other sources of electric power such as 120 volt or 277 volt etc, might be repairable after power surge, strong power surge will destroy many parts, cannot be fully insulated, can NOT be maintained to last forever. |
| All
Costs are energy Total energy-cost equals purchase-price of water heater, plus installation, plus expected maintenance, repairs-and-parts, plus water softener-and-filter, plus disposal-recycling cost, divided by years of tank life. These numbers are added to monthly energy consumption to measure true cost of a water heater. Industry promotional brochures usually consider only energy cost per gallon of heated water for brand new tank under ideal conditions. And do not consider drop in efficiency over time, or peripheral costs listed above. |
| How much does it cost to run ordinary electric water heater | ||||
| 3
hours is approximate daily run-time for water heater
[depending on
usage and temperature of incoming water etc] Examples assume ordinary 240Volt water heater/ non-simultaneous operation 5500 Watts x 3 hours = 16,500 watt-hours or 16.5 Kwh per day For a full 30-day month <=> 30 days x 16.5 Kwh per day = 495 Kwh per month for water heater electricity Calculate cost <=> 495 Kwh x $.10 per Kwh = $49.50 + add tax |
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3 hours per day
5500 Watt = 495 Kwh per month4500 Watt = 405 Kwh per month 3500 Watt = 315 Kwh per month 1500 Watt = 135 Kwh per month Watts appear on water heater label |
3
hours a day @ 10
¢
per
Kwh 5500 Watt tank = $49.50 per month 4500 Watt tank = $40.50 per month 3500 Watt tank = $31.50 per month 1500 Watt tank = $13.50 per month + add tax |
3
hours a day @ 12 per
Kwh 5500 Watt tank = $59.40 per month 4500 Watt tank = $48.60 per month 3500 Watt tank = $37.80 per month 1500 Watt tank = $16.20 per month |
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| 3
hours a day @ 14¢ 12¢per
Kwh 5500 Watt tank = $69.30 per month 4500 Watt tank = $56.70 per month 3500 Watt tank = $44.10 per month 1500 Watt tank = $18.90 per month |
3
hours a day @ $.16 per Kwh 5500 Watt tank = $79.20 per month + tax 4500 Watt tank = $64.80 per month 3500 Watt tank = $50.40 per month 1500 Watt tank = $21.60 per month |
3
hours a day @ $.20 per Kwh 5500 Watt tank = $99.00 per month + tax 4500 Watt tank = $81.00 per month 3500 Watt tank = $63.00 per month 1500 Watt tank = $27.00 per month |
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| Avg state price chart in pdf | ||||
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Tank
wattage: Figure volts amps watts for water heater 1. Find label on side of water heater 2. -or- Google brand and model number of heater to find .pdf of manual 3. Voltage & wattage also written on end of each element see example |
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 See label image |
Look
for watts on label 1. Watt rating of element(s) is usually 1500, 3500, 4500, or 5500 Watts 2. Element wattage ranges from 600 to 6000 3. Water heater wattage is same as element wattage, since both elements are not turned ON at same time. |
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 Larger image All figures are approximate. |
Use
chart to compare gas water heaters at time of purchase Call gas supplier to get therm value of your gas If your gas bill shows 60 cents per therm, then look at water heater energy factor to estimate yearly cost. For example: Cost per therm of gas is 60 cents. Difference between EF.51 and EF.63 is $33 per year Life of appliance is 10 years = $330 over 10 years Be careful to compare water heaters with same recovery and first hour delivery. Higher recovery and first-hour water heaters consume more fuel and cost more per year to operate. 13.446 lbs CO2 per therm |
| All
figures are approximate* Figures are for NEW water heater set at 120 degrees Figures are for optimal conditions: Burner is clean, combustion transfer surface is not covered with sediment, etc Temperature setting affects cost: higher thermostat setting costs more Incoming water temperature affects cost: colder water costs more to heat All costs are energy: Lower consumption and turn down thermostat to save money. Maintain water heater so water heater is not replaced frequently. Read more Gas water heater efficiency with water softener Read Efficiency is not same as energy savings/ all costs are energy. |
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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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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts Enclosures |
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