Family Chart for Setting Water Heater Timer/ Based on temperature of water Home

Meter on water heater The Kwh meter is din rail mounted inside enclosure. Records billable power usage in Kwh. Multiply by rate you pay per Kwh to get monthly/ yearly cost of running electric water heater. Buy Bomain power meter 240 volt pass through Kwh  meter 2T2502GA beige plastic enclosure 2T2500GA grey plastic enclosure din rails Resource: Enclosures How to install electric meter on 240Volt water heater

Formula for heating water inside tank: Gallon Per Hour (Electric) = (KW x 3413) divided by (temp. rise x 8.25) or (KW x 414) divided by (temp rise.) Let's say you have 5500 watt elements. let's say incoming water temperature is 65°F and you want to heat tank to 115°, or 40° rise in temperature. 5500 watt or 5.5Kw elements x 3413 = 18771.5 40 degree temperature rise x 8.25 = 330 So in this specific situation, the element would heat 56.88 gallons per hour If you have 4500 watt elements and incoming water temperature is 55°, and you want to heat to 120°, then the temperature rise is 65° 4.5 KW x 3413 = 15358.5 65 degree temperature rise x 8.25 = 536 So one element would heat 28 gallons per hour This number is for EACH element, but does NOT consider heat loss from tank, room temperature, or thickness of insulation etc. Remember, with residential simultaneous tank, only ONE element is ON at one time. Upper element is ON, or lower element is ON, or BOTH elements are off. At no time are both elements on.

Check label on side of tank for size and element wattage read more

30 Gallon Water Heater with 3500 Watt Elements 30 x 8.34 pounds per gallon = 250.2 pounds of water <> it takes .000293 Kwh to raise 1 pound of water 1° F (assuming ideal conditions inside tank) 250.2 x .000293 x rise in temperature = Kwh
Temperature of water at start time	Raise temperature to 120°	30 Gallon/ 3500 Watt Water heater > delivers 3.5 Kilowatts per hour.. Kwh needed to make 30 gallons° hot water	Set timer to make 30 gallons: (For gas heater, divide times by half)	Cost per day at ;14¢ per Kwh	Cost per day: @ 12¢	Cost per day: @ 10¢
32°	120°	6.45 Kwh	1 Hour 50 minutes	.74 per day = $22.09 mo	.77	.64
40°	120°	5.86 Kwh	1 Hour 40 minutes	.67 per day = $20.01 mo	.70	.58
50°	120°	5.13 Kwh	1 Hour 27 minutes	.59 per day = $17.58 mo	.61	.51
60°	120°	4.39 Kwh	1 Hour 15 minutes	.50 per day = $15.07 mo	.53	.44
70°	120°	3.66 Kwh	1 Hour 2 minutes	.42 per day = $12.56 mo	.44	.36
80°	120°	2.93 Kwh	50 minutes	.33 per day = $10.03 mo	.35	.29
90°	120°	2.2 Kwh	37 minutes	.25 per day = $7.52 mo	.26	.22

See chart as image
For gas calculation: it takes about 50,000 BTU to raise temperature of water 70 degrees at a rate of one gallon per minute.
This assumes gas water heater efficiency has not been reduced by sediment build-up. See efficiency illustration

54°	Approx annual average outdoor temperature for northern US states See avertage underground water temperature chart
65°	Approx annual average outdoor temperature for southern US states
	Any underground water pipe is using geothermal heat from ground to assist water heater

40 Gallon Water Heater with 4500 Watt Elements 40 x 8.34 pounds per gallon = 333.6 pounds of water < it takes .000293 Kwh to raise 1 pound of water 1° F (assuming ideal conditions inside tank) 333.6 x .000293 x rise in temperature = Kwh
Temperature of water at start time	Raise temperature to 120\°\	40 Gallon/ 4500 Watt Water heater > delivers 4.5 Kilowatts per hour.. Kwh needed to make 40 gallons of 120° hot water	Set timer to make 40 gallons: (For gas heater, divide times by half)	Cost per day at 14¢ per Kwh	Cost per day: @ 12¢	ost per day: @ 10¢
<32°	120°	8.60 Kwh	1 Hour 54 minutes	1.20 per day = $36.00 mo	1.03	.86
40°	120°	7.82 Kwh	1 Hour 44 minutes	1.09 per day = $32.84 mo	.94	.78
50°	120°/td>	6.84 Kwh	1 Hour 31 minutes	.96 per day = $28.73 mo	.82	.68
60°	120°	5.86 Kwh	1 Hour 18 minutes	.82 per day = $24.61 mo	.70	.58
70°	120°	4.88 Kwh	1 Hour 5 minutes	.68 per day = $20.50 mo	.58	.48
80°	120°	3.91 Kwh	52 minutes	.54 per day = $16.42 mo	.47	.39
90°	120°	2.93 Kwh	39 minutes	.41 per day = $12.31 mo	.35	.29

See chart as image

50 Gallon Water Heater with 4500 Watt Elements 50 x 8.34 pounds per gallon =  417 pounds of water <>it takes .000293 Kwh to raise 1 pound of water 1° F (assuming ideal conditions inside tank*) 417 x .000293 = .122181 x rise in temperature = Kwh
Temperature of water at start time	Raise temperature to 120°	50 Gallon/ 4500 Watt Water heater > delivers 4.5 Kilowatts per hour.. Kwh needed to make 50 gallons of 120° hot water<	Set timer to make 50 gallons: (For gas heater, divide times by half)	Cost per day at 14¢ per Kwh	Cost per day: @ 12¢	Cost per day: @ 10<¢
32°	120/td>	10.75 Kwh	2 Hour 23 minutes	1.50 per day = $45.00 mo	1.29	1.07
40°	120°	9.77 Kwh	2 Hour 20 minutes	1.37 per day = $41.34 mo	1.17	.98
50°	120°	8.55 Kwh	1 Hour 54 minutes	1.20 per day = $35.91 mo	1.03	.86
60°	120	7.33 Kwh	1 Hour 37 minutes	1.03 per day = $30.79 mo	.88	.73
70°/td>	120°/td>	6.10 Kwh	1 Hour 21 minutes	.85 per day = $25.62 mo	.73	.61
80°	120°	4.88 Kwh<	1 Hour 5 minutes	.68 per day = $20.50 mo	.59	.49
90°/td>	120°	3.66 Kwh	49 minutes	.51 per day = $15.371 mo	.44	.37

See chart as image

50+ Gallon Water Heater with 5500 Watt Elements 50 x 8.34 pounds per gallon = 417 pounds of water <> it takes .000293 Kwh to raise 1 pound of water 1° F (assuming ideal conditions inside tank*) 417 x .000293 x rise in temperature = Kwh
Temperature of water at start time	Raise temperature to 120° d	50 Gallon/ 5500 Watt Water heater > delivers 5.5 Kilowatts per hour.. Kwh needed to make 50 gallons of 120° hot water	Set timer to make 50 gallons: (For gas heater, divide times by half)	Cost per day at 14¢ per Kwh	Cost per day: @ 12¢	Cost per day: @ 10¢
32°	120°	10.75 Kwh	1Hour 57 minutes	1.51 per day = $45.15 mo	1.29	1.07
40°	120°	9.77 Kwh	1 Hour 47 minutes	1.36 per day = $41.03 mo	1.17	.98
50°	120	8.55 Kwh	1 ;Hour 33 minutes	1.18 per day = $35.91 mo	1.02	.85
	120°	7.33 Kwh<	1 Hour 20 minutes	1.02 per day = $30.78 mo	.88	.73
70°	120°	6.11 Kwh	1 Hour 6 minutes	.85 per day = $25.66 mo	.73	.61
80°	120	4.89 Kwh	53 minutes	.68 per day = $20.54 mo	.58	.49
90°	120°	3.66 Kwh	40 minutes	.51 per day = $15.32 mo	.44	.36

See chart as image

Use safety grab bar on bathtub Safety grab bar at Amazon Bathtub safety grab bars	Regular bath uses 13- 15 gallons hot water (20 gal water total) Set water heater timer for 45-60 minutes for hot bath Resources Compare water heater timers Off peak water heater options Buy: Bathtubs and shower stalls at Amazon	Fully heated 40 gallon tank gives 2 baths and 1 shower
	Shower uses 6 - 8 gallons of hot water (10 gal water total) Set water heater timer for 20-30 minutes for hot shower Buy: Shower stalls at Amazon Home energy savings books at Amazon	Clean shower and doors with White vinegar or CLR calcium and rust remover CLR shower cleaner Amazon Shower stalls at Amazon

See example chart	Old sizing chart Post 2015 heaters require high tech for sizes over 50 gallon Take showers instead of bath. Save 10 gallons hot water each time. To achieve same hot water consumption as previous heater withut buying more expensive heater install 2 water heaters, cut consumption, maintain heater, turn up thermostat temperature Two water heaters 9 ways to save with water heater Maintain water heater How to adjust themostat Ways to increase hot water Calculate first hour delivery
For large bathtub, use 80 gallon first hour	What size water heater? Size chart shows First Hour delivery rating First hour is capacity of tank at peak-usage times. For example at night when everybody is taking a shower or bath Increase amount of hot water with changes and maintenance How to adjust temperature How to increase amount of hot water How to maintain water heater Homes with garden tub, whirlpool bath, or oversized tub = first hour 80 gallon
Avoid oversized bathtubs. It's not cheap to heat all that hot water. Buy a spa. Drive to ocean and support tourism.	What size water heater for oversize bathtub? Large bathtub / whirlpool tub Recommend 80 gallon first hour delivery Electric: minimum 60-to-80 gallon size just for that one tub Gas: minimum 50 gallon size just for that one tub Electric heat pump water heaters generally cannot produce enough hot water. Tankless promise unlimited hot water, but temperature of water is 120 F and water in tub may be cool by time tub fills. Cost of maintenance and repairs never pay back. All costs are energy. Troubleshoot Rheem tankless Turn up thermostat on any water heater to increase amount of available hot water How to adjust temperature How to increase amount of hot water Cost to run water heater

	How to adjust temperature on water heaters
	How to install gas water heater Troubleshoot gas water heater Troubleshoot electric water heater

	54°	Approx annual average outdoor temperature for northern US states
	65°	Approx annual average outdoor temperature for southern US states
		See shallow groundwater temperature map
		Read sediment; sediment removal; softened water

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

Resources: Troubleshoot Gas valves with manuals	How to replace water heater element	How to wire tankless electric Install point of use water heater
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