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Can 20-gallon electric water heater be used for whole house whose occupants use little hot water
 
Use 6 wraps teflon tape
? White for water lines
? Yellow for gas lines

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Teflon tape at Amazon

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Pipe wrench at Amazon
Channel locks

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How to remove rusted element


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Knipex channel locks
Irwin pliers
replace anode rod
Inspect anode each 2-5 years
Anode rod prevents tank from rusting
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Anode rods at Amazon

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Replace anode rod
How to maintain water heater

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Impact wrench at Amazon

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Replace anode rod
How to remove short water heater nipple
Water pressure gauge

Pressure gauge/ attach to water heater drain valve
Pressure over 80 psi can damage water heater and household plumbing
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Water pressure gauge
Temperature-pressure gauge

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Identify water heater valves
Troubleshoot water pressure
Automatic water heater shut off valve
Prevent flood
Automatic water shut off valve
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Leaking water heater/ steps
Pressure reducing valve
Pressure reducing valve
Pressure over 80 psi can damage water heater and household plumbing
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Identify water heater valves
Troubleshoot water pressure
Sharkbite pressure gauge
Sharkbite pressure gauge

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Sharkbite pressure gauge

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Water heater valves

Water heater circulation system

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Grundfos at Amazon

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How to install recirculation system
COLD side Sharkbite flexible water heater connector
COLD side Sharkbite flexible water heater connector

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Sharkbite water heater connection
Braided water heater line
Stainless steel flexible connection

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How to install electric water heater
How to install gas water heater
Leaking water heater
HOT side Sharkbite flexible water heater connector
HOT side Sharkbite flexible water heater connector

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Sharkbite water heater connection
Braided water heater line
Stainless steel flexible connection
Braided water heater line
Flexible water heater connection

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How to install electric water heater
How to install gas water heater
Leaking water heater
89T thermostat kit
Electric water heater thermostats
Thermostats stick melt and come out of calibration... replace thermostat
Symptoms: Cold water, uneven temperatures, reset tripping, TP releasing water
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Icon gas valve   
Gas water heater thermostats
If tank is overheating or not heating correctly, replace thermostat
Symptoms: Cold water, uneven temperatures, TP releasing water
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How to replace gas water heater thermostat
Add another thermostat to water heater
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Reliance water heater
Reliance 120 volt/ 1600 watt
6-10 gallon
Side connections/
6 year warranty
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Reliance water heaters
12 ga extension cords
12-2 Southwire cable
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Reliance manual
State manual
American tiny titan water heater
American 120V/ 1500 watt
6-12 gal
Top connections/
6 year warranty
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American 12 gallon
12-2 Southwire cable
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American manual
State point of use water heater
Rheem
2-6-10-20 gallon
Side connections/
6 year warranty
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Rheem point of use
12-2 Southwire cable
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Rheem manual
COLD side Sharkbite flexible water heater connector

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Sharkbite water heater connection
Braided water heater line
Copper flexible connection

Advisory about stainless connections: Stainless is reactive with softened water, will cause deterioration of stainless.
Stainless steel connection
water heater stand
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Holdrite at Amazon
Steel pegboard
Hyloft storage hardware
Garage storage

Resource:
Use 20 gallon water heater for tankless recirculation

Howard asks?
If peripheral installations are impractical, can 2000W electric 20-gallon-tank point-of-use water heaters be installed in central boiler rooms to heat domestic water for whole houses whose occupants use little hot water?
Answer
water consumption bathtubBath uses 15 gallon hot, so a 20 gallon would probably be bare minimum.Typical shower uses 4-9 gallon hot.Thermostat set to 120, and typical bath shower 100-110°F
If your existing power is 240 volt, then select heater rated for 240 volt and not 120 volt.
Resources:
Increase-amount-of-hot-water.html
9-ways-to-save-with-water-heater.html

FYI
We have 2 people in home and use hot water sparingly, and have 240 volt 30 gallon heater that costs 19$ a month to operate.We can get two baths staggered hour apart, or bath and a shower at same time.
Resource:
H
ow-to-install-electric-meter-on--240-volt-water-heater.html
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How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
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