Two water heaters
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Install two water heaters

Step #1: Identify if water heaters are series or parallel
Applies to gas and electric water heaters
Two water heaters
Series connection purpose: twice as much hot water
Be sure to insulate pipes

Applies to gas and electric water heaters

Water heaters in series:
Hot water from #2 water heater feeds into #1
Purpose: Twice as much hot water available.
Avoid buying 80 gallon heat pump water heater... install two tanks
Lets you fill large bathtub without buying heat pump water heater

How to control cost:
1) Turn off heater #2 and save $40 per month
2) Use heater #2 as tempering tank to passively raise temperature to ambient room temperature 
3) Install timer on heater #2 or both heaters 
4) More ideas: Insulate pipes, Insulate water heaters, Turn down thermostats,
Resources:
Tempering tank
Compare timers
9 ways to save
How much does it cost to operate water heaters
Add another thermostat to water heater
Two water heaters
Convert parallel to series means one water heater can be turned off
Be sure to insulate pipes

Applies to gas and electric water heaters

Water heaters in series:
Hot water from #2 water heater feeds into #1
2 separate hot water lines for different parts of house.
Let you install mixing valve to lower temperature on one line

Advantage:
Turn off heater #2 and save $40 per month
Use heater #2 as passive tempering tank to preheat cold incoming water
Install timer on heater #2 or both heaters

Resources:
Mixing valve
Temperature needed to kill bacteria
Tempering tank
Compare timers
two water heater 1 softener
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One softener, two water heaters

Softener cannot be put on hot water. It must be installed on cold water.
You cannot run hot water into softener. Hot water will damage softener.
One softener can supply soft water for two heaters.
Two water heaters can be plumbed in any of the configurations shown on page, parallel or series.

Remember a softener can cause odor problems on rural water well.
Softener water will also deplete the anode rod.
If you have odor problems, or tanks rust out frequently, the softener is best suspect.
Turn down the softening, or remove softener, or replace anode rod frequently, or install power anode rod, or add hydrogen peroxide frequently:
Resource:
How to replace anode rod
Two water heaters

20 gallon point of use/ Total 40 gallon/ or 60 gallon

Applies to electric water heaters only

New water heater standards may affect installation of new 60 gallon water heater
New 60 gallon water heater might be 4-6" wider and not fit into space.

Typically these 120 volt water heaters arrive with one element rated for 1500-3000 watt
Element voltage and wattage shows on end of each element.
Watts divided by volts equal amps
3000 watt divided by 120 volt = 25 amp... use 30 amp breaker
1500 watts divided by 120 volt = 12.5 amps ... choose 20 amp breaker
1500 watt will raise 6.9 gallons from 60 to 120 each hour

If you have 240 volt line, you can change the breaker wiring in the panel into 120 volt.
To change 240V line into 120V line... the 240V has 2 hot wires. Move one hot wire to neutral busbar.

If you connect 240 volt to 120 volt element, the element will burn 4 times hotter/ and burn out.

If you want to convert 120 volt water heater to 240 volt, then element must be changed.
Buy elements rated for 240 volt.
Thermostats are single-element type with 2 screws on right side of thermostat
Thermostats do not need to be changed if each tank is wired independently.
If heaters are wired together, then change thermostat to dual-element type with 3 screws on right
120 volt and 240 volt wire the same way at top of tank... either wire to either wire unless specified

Wiring diagrams below can apply to these water heaters, with variations

Resources:
Figure volts amps watts for water heater
Convert 240 volt to 120 volts
Match wire and breaker size
How to change thermostats
How to install electric water heater
Chart for figuring heating time
Kwh needed to heat water

Point of use water heaters are electric, but not gas

Resources:
How to install point of use water heater
How to install electric water heater
Gas water heater timer
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Control gas water heaters with timer or zwave or wifi

Resource:
Instructions and promo code for gas water heater timer
Two water heaters
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Applies to electric water heaters only

Adding second water heater to increase amount of hot water at peak times:

Electric:
Install upper thermostat in place of Lower thermostat
This will give ECO protection to lower thermostat
You want to heat tank #1 first... and then tank #2
Or you can wire each one separately using 2 separate circuit breakers and 10 gauge wires

Resources:
How to install water heater thermostats
How to wire water heater thermostats
Convert 240 volt water heater to 120 volt
Add another thermostat to water heater

Gas:
When adding second gas water heater, total BTU of both heaters must be calculated. Call local gas company Read label on side of each tank for BTU rating. For example both heaters together 100,000 BTU, and gas pipe length is 80 feet, then 3/4" pipe is needed.
Resources:
Gas pipe chart
How to install gas water heater
Wiring for two water heaters

Applies to electric water heaters only

2 non-simultaneous water heaters on one 30 amp wire
Example illustrations below

Resources:
How to install water heater thermostats
Add another thermostat to water heater
How electric water heaters work
Two water heaters
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Two water heaters
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Wiring for two water heaters

Applies to electric water heaters only

1 non-simultaneous water heater and 1 off-peak water heater


Resources:
How to install water heater thermostats
Add another thermostat to water heater
-Pressure should not drop when two water heaters are installed.
Entire household water system is pressurized by incoming water pressure from city supply, mudd district or water well.
There is no air inside the tank... or water lines... so all pressure remains the same assuming no restrictions in pipe, no leaks, etc

-You can easily check pressure using pressure gauge on water heater drain valve or outdoor faucet
Low-hot-water-pressure
-Pressure can be higher... does not apply to every 2-tank installation

... depending on temperature setting of each water heater...
Over 140 degrees can cause high pressure that expands into the pipes located above water heater
HIGH pressure over 80 PSI can damage tank and plumbing over period of time

- Locating 2 water heaters next to each other 'might' cause a closed system if both water heaters are set to fairly high temperatures
(oops, been meaning to add this detail to the webpage)
-To stabilize pressure, use expansion tank on incoming cold water line
Water-heater-valves and pressure reducing
wire water heater thermostat

How to change wiring / foam-insulated tank

Rewire foam insulated  tank
Drill through top of tank near wiring cavities
Keep drill bit near outer edge of tank shell

Buy
36" drill bits

Resource:
How to re-wire electric water heater
How to wire thermostats
Add another thermostat to water heater
electric thermostat on gas water heater   electric thermostat on gas water heater

Add another thermostat to gas or electric water heater

Control recirculating pump
Control electric water heater with gas water heater
Control solenoid valve to turn hot water ON

Resource:
Add another thermostat to water heater/ step by step
Upper and lower thermostats
thermostat temperature range

Buy residential upper and lower thermostats

Thermostats are interchangeable/ each works with your water heater
Buy 90-150 degree F for residential tank:

Water heater thermostats at Amazon
Camco thermostats at Amazon
More thermostats
89T short/ dual-element thermostat at Amazon
Example Camco dual-element thermostat at Amazon

Resources:
How to install water heater thermostats
DIY help for 2 water heaters: Make lower thermostat from upper
Read about two water heaters

Best to replace both thermostats.
There is no guaranteed way to test thermostats.
If thermostat is sticking, then test includes rotating temperature knob which can temporarily unstick thermostat. So bad thermostat appears to work correctly.
c

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Correct plumbing saves money
Applies to gas and electric water heaters

Insulate pipes
Heat traps slow convection loss. Minimum 6" drop.
Jumper ground wire stops stray current corrosion
Di-electric connections to protect water heater and pipes

Resources:
Read 9 ways to save
parallel water heaters

Applies to gas and electric water heaters

Water heaters in parallel:
Cold water feeds into both water heaters
Hot feeds out on one pipe
Purpose: double amount of available hot water

Turn off one heater in summer months or when demand is low
Two water heaters
Parallel water heaters supply hot water to different usage points
Be sure to insulate pipes

Applies to gas and electric water heaters

Water heaters in parallel:
Cold water feeds into both water heaters
Purpose: Different areas of house served by different water heater
Heaters #1 and #2 last as long as each other.

How to control cost:
1) Identify which faucets receive hot water from each water heater.
2) See if pipes can be connected to one water heater shown in illustration below.
3) Use countertop pot heater. Use under-counter water heater at local sink.
How to install under-counter water heater
4) Install timer on less-used water heater.
Compare timers
5) Reduce thermostat on less-used water heater
See how to adjust temperature

6) Insulate pipes, Insulate water heaters, Turn down thermostats, etc
Read 9 ways to save
Two water heaters Water electric heaters in parallel:
Cold water feeds into both water heaters
Return line with check valve shown if recirculation pump is used
Twice as much hot water
Two gas water heaters Water gas heaters in parallel:
Cold water feeds into both water heaters
Return line with check valve shown if recirculation pump is used
Twice as much hot water

Under-counter heater
Small heater at sink can reduce need for 2nd water heater
Pot heater
Under-counter heater can reduce need for larger water heater.
How to install under-counter water heater
Tempering tank
Tempering tank, or staging tank can pre-heat cold incoming water in winter
Passively preheat water to ambient room temperature.
Tempering tank located in naturally warm location can preheat water before it flows into cold water side of water heater.

Buy scratch-n-dent water heater

Use old water heater as tempering tank
Flush with water and 2 pints hydrogen peroxide.

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For electric water heaters: Review wiring options

Resources:
How to wire thermostats and elements
How to troubleshoot electric water heater

Ready for peak electric prices?
How-to-wire-water-heater-with-switches-and-timers
How to wire off-peak water heater thermostats
Resources:
How to install electric meter on water heater

Timer for two electric water heaters

WHQ4 Water heater timer Intermatic FM1 timer
FM1 timer with 15 minute intervals
or 7-day timer with 2 hour intervals
Intermatic WHQ water heater timer
Works for two 4500 watt water heaters


Resources:
How to wire GM40 series timers

Resources
Choose 120V 208-240V 277V
Skip-a-day
WHQ series sell sheet

24-hour timer
WHQ4 sell sheet
7-day timer
WHQ7 sell sheet

Compare more timers
Intermatic timers and manuals


Timer for two water heaters Intermatic WHQ water heater timer

Many ways to control two electric water heaters
This is not a two-channel timer, so each water heater will operate on same time schedule

Resources:
How to wire GM40 series timers
WHQ4 Water heater timer  WHQ water heater timer WHQ controls two 4500 watt water heaters

Look at water heater label for tank wattage: Label shows total connected wattage

Use 40 amp circuit breaker and 8 gauge wire from breaker box
Use 8 gauge wire between timer terminals
Use 8 gauge or smaller 10 gauge wire to each water heater

Do not mix different gauge wires under same screw terminal or smaller gauge wire can come loose and become fire hazard.

Resources:
How to wire GM40 series timers
WHQ4 Water heater timer    WHQ controls two 4500 watt or 5500 watt water heaters with opposite schedule.

When heater #1 is ON, heater #2 is OFF

Resources:
How to wire GM40 series timers

Control each water heater with different schedule

Compare timers Resources:
Compare water heater timers
Compare Box-type water heater timers
Control 2 water heaters
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Control 2 water heaters

Each water heater can have different 7-day schedule

10 gauge wire and 30 amp breaker run cooler.
30 amp circuit breaker and 10 gauge wire for water heater runs cooler with less energy loss. Breaker box lasts longer.

Different wiring:
For two 4500 watt water heaters, you can use one 40 amp breaker and 8 gauge wire to bring power from breaker box to the first timer.

For two 5500 watt water heaters, you can use 50 amp breaker and 8 gauge wire

Resources:
Water heater timers
EH40 water heater timer
Things you can do to increase amount of hot water

9 ways to save with water heater
Things to do to increase amount of hot water:
How to increase amount of water:
Adjust thermostat to higher temperature. How to adjust thermostat
Install shower timer so more people can shower before hot runs out.
Install low flow shower heads and aerators so hot lasts longer.
Take showers instead of bath. Shower uses 5-9 gallons hot water, bath uses 12-15 gallons
Take showers in quick succession so hot water located at top of tank does not cool when incoming cold water arrives.
Install larger water heater tank.
Install two tanks. Two water heaters
Install under-counter water heater at sinks.
Install insta-hot faucet in kitchen.
Use pot boiler at kitchen sink.
Leave gallon jugs of water in sun during day for hot water needed at lunch or dinner.
Install solar water heater in addition to other sources. Solar water heater
Install tempering tank next to regular tank to passively preheat incoming cold water in winter. Tempering tank
Electric: convert elements from non-simultaneous to simultaneous operation. requires additional circuit breaker and wire to heater, and rewire of heater. Simultaneous wiring
Install mixing valve so some usage points receive warm water while others receive hotter water. How to save hot water using mixing valve
Do not turn on hot water when using cold water. Single handled faucet lifted straight up will cause cold water to immediately enter tank. Crossover
Turn off hot water to washing machine.
Wash dishes by hand.
Install dishwasher on cold water line instead of hot.
Reduce water pressure in house using pressure reducing valve. Turn down water well pressure. Hot water lasts longer. Plumbing pipes and fixtures last longer.
Clean restrictions in pipes. Low hot water pressure
Shorten distance from hot water tank to usage point. Distance hot water travels in 30 seconds
Gas water heater: install external air intake so ambient room temperature is not lowered in winter when combustion draws cold air through cracks and doors.
Install water heater with higher recovery rating, and higher first-hour delivery.
Clean sediment out of tank to increase efficiency. How to remove sediment/ efficiency numbers
Insulate water pipes throughout house. Insulate water heater .Read 9-ways to save with water heater
Low water pressure
Water heater safety precautions
Global DPDT switch
Gas and electric water heaters Industrial electric at Amazon

Industrial supplies at Amazon

Industrial and scientific Amazon
box timers Compare box timers

Control water heater w/ Z-wave
Intermatic control centers Intermatic control centers:
+ manuals and parts


All control centers and parts

Including Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
Low voltage power packs Low voltage transformers

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