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How to install under counter water heater/
Strategy for downsizing main water heater or supplying instant Hot water

120V hardwire or use 12-3 extension cord / 3/4" connections/ Repairable by homeowner
Reliance water heater
6-10 gallon
Side connections/
6 year warranty
Reliance water heaters
12-3 extension cords
12-3 southwire cable
Reliance manual
State manual
American tiny titan water heater
6-12 gal
Top connections/
6 year warranty
American tiny at Amazon
12-3 extension cords
12-3 southwire cable
American manual
State point of use water heater
2-6-10-20 gallon
Side connections/
6 year warranty
Rheem point of use
12-3 extension cords
12-3 southwire cable
Rheem manual
COLD side Sharkbite flexible water heater connector

Sharkbite water heater connection
Braided water heater line
Stainless steel connection
water heater stand
Holdrite at Amazon
Steel pegboard
Hyloft storage hardware
Garage storage

Use 20 gallon water heater for tankless recirculation

Plug into 120V 3-prong outlet/ Temperature control on front/ 2.5 - 6 gallon/ Non-generic parts/ Repairable
Ariston water heater
Ariston / Bosch
2.5 - 4 gallon  - 7 gallon
Top connections/
2 year warranty
Ariston at Amazon
Bosch at Amazon
Ariston resources
Bosch P10 P5
State point of use water heater
State / Reliance
American/ are all AO Smith
2.5 - 6 gallon
Top connections/
6 year warranty
American 2.5 Amazon
Reliance 6 gal Amazon
Reliance manual
Waiwela awter heater
2.5 - 4 gallon
Top connections
6 year tank warranty
Waiwela at Amazon
Waiwela mini tank
Emax point of use water heater
1.3 - 2.5 - 4 - 6 gallon
6 year tank warranty
Eemax water heaters
Chronomite 2.5 gallon
Eemax manual/ parts
Stiebel-Eltron point of use
Stiebel Etron
2.5 - 4 gallon
Top connections
2 year warranty
Stiebel Eltron water heater
Steible 2.5 manual

Tankless/ 120-240V hardwire/ 30 amp 10 gauge wire/ Tankless units are connected to incoming cold water line.
Must be dedicated circuit with no other load on breaker Some repairs possible/  How to wire tankless electric
Match breaker size and wire
tankless under counter
2 year parts-7 year leak warranty
120-240 volt models
Buy at Amazon
120 Volt 30 amp Amazon

Atmor Installation manual

How to wire tankless electric

Match breaker size and wire

Eemax point of use water heater
Hardwire 120 Volt
7" x 11" x 3"
Eemax SP3512 120V
3500 watt/ 30-40 amp
Eemax SP35 240Volt

Eemax tankless manual
Sell sheet with wire size chart
Ecosmart point of use
Hardwire 120 Volt
7" x 11" x 3"
.25 gpm
Ecosmart water heater
3500 watt/ 30-40 amp
6000 watt/ 30-40 amp
18,000 watt/two 40 amp

Ecosmart manual
Ecosmart troubleshoot
How to wire tankless electric
Stieble Etron point of use
Stieble Etron Mini
Hardwire 120 Volt
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

Steible Eltron mini manual
Stieble DCH manual
Chronomite tankless water heater
Hardwire 120 and 240V models
Buy at Amazon
Chronomite water heater

Chronomite manual

Bosch 3.4 120V
3400 watt/ 30 amp
Bosch 9.5 240 Volt
9500 watt/ 40 amp

Bosch powerstar manual

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
2) Pay attention to Hot and Cold inlets
If inlets are reversed, tank will not perform as expected.
Source of water must connect to Cold inlet on water heater
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shut off valveWhat if... no drain valve on tank?
Install drain valve on cold water inlet
Install shut-off on cold water line

No drain valve on water heater?
Remove TP valve and siphon water from tank

Lead-free ball valve at Amazon
Chrome shut off valves at Amazon

under counter water heater
a) Spend more for more hot water.
b) Spend less for less hot water

Chrome shut off valves at Amazon
3) Connect water heater to hot or cold?

a: Connect to Hot source. See image
Costs more: This draws hot water from main water heater so after under counter tank gets cool, more hot water arrives from main tank and temperature stays about same.

b: Connect to Cold source. See image When using under-counter water heater for hand-washing, this is best option

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Option a/ Connect to Hot source: hot water arrives from main tank as under-counter tank runs out of hot.
Connect hot water source to the cold water inlet on tank
Use teflon tape on threads

Advantage option a: Plenty of Hot water.
Problem with option a: 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.
How to solder pipe
Install under counter water heater
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Option b/ Connect to Cold source: spend less/ hot water limited to amount inside under-counter tank.
When using under-counter water heater for hand-washing, this is best option.
When installing tankless, use this option.

Problem with option b: Hot water supply is limited to amount of hot water in under counter tank.
Under counter water heater supplies all hot water at faucet.
Advantage option b: Costs less. Each time hot is drawn from faucet, cold water does not enter main water heater.

Connect cold water source to the cold water inlet on tank. Hot source pipe is capped.
Use teflon tape on threads
How to solder pipe

Pot heater
Pot heaters at Amazon
Other options/ Instead of installing under counter heater
a) Use pot heater
b) DIY solar: Set 2 gallons water outside in sun each day
c) Install recirculation system
How to install recirculation system Point of use water heater
4) Do not drop water heater
or 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.
How to troubleshoot electric water heater

5) Earthquake straps / safety
Secure water heater to structure when possible to avoid pipes coming loose.
Electric water heaters can be set on or against any wood, carpet, plastic etc surface.
Cover all electrical outlets and connections with approve plate, and keep cover(s) on side of tank to protect from electrical short causing fire. Secure wire and conduit to structure.
Overflow tube and water leaks can cause water damage
Earthquake straps at Amazon
See earthquake strap illustration  
Earthquake map
Solder copper pipes Solder copper pipes

Most under-counter 6 gallon and 12 gallon water heaters have 1/2" connections.

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.
How to solder copper pipes
Drip pan
Drip pan

6) Drip pan saves damage
Drip pan saves damage
See drip pan installation
Water heater drip pans at Amazon
Water detectors at Amazon
Auto-shut-off valve at Amazon

Do NOT cap off TP
7) TP overflow code
Temperature-pressure relief valve is required for safe operation of water heater. DO NOT CAP OFF.
TP spews scalding water when internal temperature and pressures exceed safe limits. This prevents water heater explosion. Direct overflow tube to nearby drain or to outside.
Overflow tube must be as short as possible and same diameter as valve discharge connection. Do not downsize into smaller pipe. Overflow tube maximum 4 elbows and 30 feet length. Overflow must terminate 6" above drain or water line.
Ideal to vent TP directly outdoors ending in a downward pipe. Overflow pipe must pitch downward, and cannot be under water. TP valve can draw water back into water heater if end of overflow tube is under water. End of overflow tube cannot be threaded.
Gently open and close TP valve once each 1-3 years to make sure valve is functioning.
How to test, maintain, and replace TP valve

Element burns out
Tank must be full of water
8) Tank MUST be full of water
Element 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.
How to test element
9) Insulate tank and pipes
Do NOT block TP valve lever
Electric water heater can be totally covered with insulation except TP valve

Troubleshoot and service giuide
How to troubleshoot electric water heater

Point of use service manual
Bosch Ariston resources
How to maintain water heaters
Commercial point of use service manual

For tankless electric:
How to wire tankless electric water heater

Other manuals:

Hubble 2.5 gallon manual
Bradford White instantaneous
Emmerson point of use
Insinkerator manuals
Boil water faucet- new product

Water heater manufacturers
Finished install

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Showing side connections, electric conduit top of tank, drain pan and TP overflow tube going to floor drain. Allow 6" space between TP overflow tube and floor drain.
Or overflow tube can be directed outdoors
Does not show drain valve installed.
Under counter water heater
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Showing 120 volt plug and outlet for some models.
Do not use extension cord.
Outlet must have correct polarity and be grounded.
Check outlet with circuit analyze.
TP overflow tube has 6" space above floor drain.
Drip pan has overflow tube touching floor drain.

Basic House wiring

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Showing drain valve installed on cold water inlet
Showing location of anode rod

How to replace anode rod
Electricity to Under counter water heater

Never assume power is OFF
Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.

Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon
Test water heater
120Volt water heater
color-code household wire120volt water heater has Black and white wire

120Volt household electrical line has Black and White and bare ground.
Connect black to black and white to white.
Ground wire must be connected to ground screw.
Apply correct wire connector and twist very tight.
How to twist wire and install wire connectors
How to drop wire from attic
Color code and wire rating
Put cover over all electrical connections.
No wire available for 120 volt installation?
120 volt under counter water heater requires dedicated breaker that serves no other appliance.
What if you can't run another wire from the breaker box. No problem, split duty with the dishwasher, or microwave oven.
The water heater does not need power full time. Dishwasher is only used now and then. Use a switch or a timer to toggle between each load.
water heater circuit
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.

Connect incoming hot wire to COM terminal on 3-ways. Connect Hot wire going to each appliance to other two terminals on switch

water heater circuit
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Calculte electrical demand
1) Read label on side of water heater. Find watt and volt rating.
Watts divided by 120Volts = amperage
120Volt 1500 watt water heater consumes 12.2 amps.

2) Read label on dishwasher: Typical dishwasher consumes 6-11 amp at max draw.

3) Label circuit breaker that connects to dishwasher. Check other loads (lights, TV, etc) that are connected to same breaker. Add up total wattage of all items on breaker. Divide wattage by 120Volt to find total amp draw on breaker. Add 6-11 amps drawn by dishwasher to find total load.

4) Can you safely add another 12.2 amp water heater to the circuit?
Electrical capacity calculation:
1) 15 amp breaker with 14 gauge wire is recommended at 80% rated load = 12 amp load.
2) 20 amp breaker with 12 gauge wire is recommended at 80% rated load = 16 amp load.

3) Combined load for dishwasher and water heater is 18.5-22.3 Amps.
If you have 15 amp breaker or 20 amp breaker, then d ishwasher and water heater should not be turned ON at same time.

Hubble 750-1000 watt 2-1/2 gallon with 1/4" male connections

1500 Watt 2-1/2 to 6 gallon

Typical 1500 watt 20 gallon
FM1 timer
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Wire 1500 watt water heater to FM1 timer
FM1 timer rated for 21 amps/ max 2000 watts
21 amp x 120volt = 2520 watt x 80% = 2016 watts

Buy: FM1 timer module/ 7-day or 24 hour
Intermatic/ Grasslin FM1 timers at Amazon
24-hour 14 minute 120Volt 60 Hz at Amazon
7-day 2 hour increments 120volt 60 Hz at Amazon
24-Hour 240Volt 60 Hz at Amazon
7-day 240Volt 60 Hz at Amazon
Larger imageFM-1 timer
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.
Timer toggle between applainces
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Dishwashers at Amazon
Toggle between 240 volt appliances:
Toggle between 30 amp clothes dryer and 30 amp water heater.
Toggle between 50 amp rang and 50 amp tankless water heater.

Choice of timers:
Tork TU and DTU
Intermatic GM40, GMQ, GM40AV, GM40AVE
Woods 59402, WiFi
GE 15135, 15136
See all these timers together
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

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Troubleshoot electric water heater
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Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric

Install point of use water heater
Titan tankless

Contactors/ relays
Install and troubleshoot garbage disposal Waste King disposal
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Anode rods anode rods
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Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection

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box timers Resource:
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Control water heater w/ Z-wave
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Intermatic control centers: and parts
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