Two water heaters
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Install two water heaters

Series:  Applies to gas and electric water heaters
1st water heater feeds into 2nd water heater
Advantages: 1st tank can be turned off and serve as tempering tank, Turn 1st water heater off except when peak usage is expected.
Double water heating capacity, avoid buying large expensive water heater, lets you fill oversized bathtub without buying 80 gallon heat pump water heater.
Two water heaters
Parallel: Applies to gas and electric water heaters
Cold water feeds into both water heaters. Use when house has water line to two parts of house. Advantages: Double water heating capacity, avoid buying large expensive water heater, lets you fill oversized bathtub without buying 80 gallon heat pump water heater.
parallel water heaters
Two water heaters

Series option #1
Hot water from water heater #1 feeds into #2
Both water heaters supply whole house
Purpose: Twice as much hot water available

How to control cost:
1) Turn off heater #1 and save $40 per month
2) Use heater #1 as tempering tank to passively raise temperature to ambient room temperature 
3) Install timer on heater #1 or both heaters 
4) More ideas: Insulate pipes, Insulate water heaters, Turn down thermostats and save, turn up thermostats and install mixing valve to increase amount of hot water.
Buy:
Water heater installation kit
Shark bite water heater connection
Resources:
Tempering tank
Compare timers
9 ways to save
Add another thermostat to water heater
Mixing valve
Two water heaters
Series option #2 
2 separate hot water lines for different parts of house.
Purpose: Twice as much hot water available.
Turn up water heater thermostats and add mixing valve to moderate temperature on pipe going to bathroom and allow hotter water on pipe going to washing machine.

How to control cost:
1) Turn off heater #1 and save $40 per month
2) Use heater #1 as tempering tank to passively raise temperature to ambient room temperature 
3) Install timer on heater #1 or both heaters 

Resources:
Mixing valve
Temperature needed to kill bacteria
Tempering tank
Compare timers
parallel water heaters Parallel option #1 
Both water heaters supply whole house
Increase heating capacity without buying large, expensive heater
Disadvantage from series: both heaters must run unless you install shut off on hot water line leaving one of the two heaters

Buy:
Ball valve
Brass gate valve
40 gallon electric water heater
40 gallon gas water heater
two water heaters Parallel option #2
2 separate hot water lines for different parts of house.
Increase heating capacity without buying large, expensive heater
Disadvantage from series: both heaters must run unless you install shut off on hot water line leaving one of the two heaters
two water heater 1 softener Effect of water softener on two water heaters
-One softener can supply soft water for two heaters, any configuration.
-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.

Effect of water softener on water heaters in general
-Softener can cause odor problems on rural water well.
-Softened water will deplete the anode rod, causing rusted tank
- If you have odor problems, or tanks rust out frequently, the softener is suspect. Turn down the softening, or remove softener, or replace anode rod frequently, or install power anode rod, or add hydrogen peroxide frequently.
Buy:
Water softener

Resource:
How to replace anode rod
Two water heaters 20 gallon point of use/ Total 40 gallon
Applies to electric water heaters only
20 gallon point of use water heaters are electric

Typically 120 volt water heaters arrive with one element rated 1500 watt.
Element voltage and wattage shows on end of each element.
Watts divided by volts equal amps
1500 watts divided by 120 volt = 12.5 amps ... use 20 amp breaker
1500 watt will raise 6.9 gallons from 60 to 120 each hour.
Buy:
20 gallon water heater

Resources:
Figure volts amps watts for water heater
How to install point of use water heater
How to install electric water heater
Two water heaters Gas or electric water 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

Resources
How to install gas water heater
How to install electric water heater


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Full image
Two water heaters and circulating system
Sows return line installation, aquastat (thermostat) on hot water line, and 2-80 gallon heat pumps

Buy:
Grundfos circulating pumps
Grundfos clip-on aquastats

Resource:
Recirculating system designs
Aquastat manual
Gas water heater timer
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Timer or zwave or wifi for gas 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.

Buy:
Gas water heater timer at American Pacific
Enter coupon code: GENO to save $5
Resources:
Gas pipe chart
Instructions for gas water heater timer
Control 2 water heaters
Larger image
Timer or zwave or wifi for electric water heater
Each water heater can have different schedule

Resources:
Water heater timers
EH40 water heater timer
Zwave controller

WHQ4 Water heater timer  WHQ water heater timer One timer for 2 water heater
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.

Resource
How to wire GM40 series timers
Wiring for two water heaters 2 ordinary residential non-simultaneous water heaters on one 30 amp wire and breaker
Wiring illustration
Applies to electric water heaters only

Important: 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
wire water heater thermostat
Buy
36" drill bits

Resources:
How to install water heater thermostats
Add another thermostat to water heater
How electric water heaters work
Two water heaters
Actual installation photo.
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Two water heaters
Where to connect wires going to second tank. Actual installation photo.
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Two water heaters
Larger image
1 ordinary non-simultaneous and 1 redundant water heater on one 30 amp wire and breaker
Applies to electric water heaters

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
Wiring for two water heaters 1 ordinary non-simultaneous water heater and 1 off-peak water heater on one 30 amp wire and breaker
Applies to electric water heaters



Resources:
How to install water heater 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
Temperature range 90-150 Therm-o-disc/ reset trip @ 170
Temperature range 110-160 Aprom/ reset trip @ 180
Local YMCA hot tub = temperature 105/...  Typical shower-bath = 110F
Rated 120, 208, 277, 480 volt AC

Buy 90-150 degree F for residential tank:
Water heater thermostats at Amazon
Rheem thermostats
More thermostats
89T short/ dual-element thermostat
All therm-o-disc products

Resources:
Therm-o-disc 59T-66T sell sheet/ pdf
Therm-o-disc thermostats
How to install water heater thermostats
Difference between Rheem thermostats
Make lower thermostat from upper

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.
120 volt or 240 volt
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 for 120 or 240 volt.
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 electric water heaters.

Resources:
How to wire thermostats and elements
How to troubleshoot electric water heater
How-to-wire-water-heater-with-switches-and-timers
How to wire off-peak water heater thermostats
Figure volts amps watts for water heater
Convert 240 volt water heater 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
Things you can do to increase amount of hot water
9 ways to save with 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 check pressure using pressure gauge on water heater drain valve or outdoor faucet
Buy:
20 gallon water heater
Water softener
Pressure gauge

Pressure depends partly on temperature setting of each water heater... Over 140 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.
-To stabilize pressure, use expansion tank on incoming cold water line
Buy:
Expansion tank
Pressure reducing valve
Resources
Low-hot-water-pressure
Troubleshoot water-heater-valves
Troubleshoot Gas valves with manuals Icon gas valve

How to replace elements

Replace thermostats
How to wire tankless electric

Install point of use water heater
Titan tankless
Anode rods anode rods
Recirculation system Point of use water heater
Type 1 and type 2 surge protection surge protection

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

Elements
Resources:

How to replace element
How to test element
How to install electric water heater
Troubleshoot electric water heater
How to remove old element
Marathon water heater elements
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