Waterheatertimer.org
is a self-help website
Compare 16 electric and 2 gas water heater timers 9 Ways to save with a water heater
See new water heating ideas 2010
Do-it-yourself
            Emergency steps: how to turn off water heater
                           Leaking water heater
                           Flooded water heater
How to troubleshoot electric water heater
How to troubleshoot gas water heater
How to replace thermostat
How to wire thermostats
2014
TP valve

How to troubleshoot and replace TP valve

Resource:
Read forum article
Read about TP valves
Read more about TP valves
Buy TP valves:
Replacement TP valves at Amazon
Teflon tape at Amazon

Symptom

Action

What to look for:

TP valve leaking water Water heater should be dry at all times.

Is TP leaking, or water heater leaking?
Use masonite to check if TP valve is releasing water.
Some TP valves drain directly into drain pipe. Turn off all taps and put ear against pipe to hear sound of escaping water.
If TP valve is continuously running out hot water, tank will have less hot water.
Resource:
Leaking water heater

Quick fix for leaking TP:

Raise TP lever
Raise TP lever for 5 seconds.
See if obstruction is flushed out
Caution: Keep Feet away from hot water coming from discharge tube!

Do NOT cap off TP valve

Caution:
Do not cap off TP valve or discharge tube.
Do not plug or obstruct TP valve or discharge tube.
Obstructing TP valve can lead to explosion of water heater tank.

Steady flow of water from TP

Raise TP lever to clear blockage.
Then if problem continues:
Replace TP shown in steps below
If water is unusually hot, then thermostat is bad:
Bad thermostat: Replace Gas thermostat
Bad thermostat: Replace Electric thermostat
Bad electric element: Test elements

Weeping TP valve

Dribbling, intermittent weeping:
Foreign material in seat valve: Open valve to clear problem. Replace TP valve/ steps show below.
High pressure:
Check pressure with gauge on drain valve as shown below.
Install pressure reducing valve and expansion tank.
Reduce tank temperature:  How to adjust temperature
Replace TP shown in steps below

Large volume hot water released sporadically

Bad thermostat
Malfunctioning thermostat is only cause
High temperature limit is around 210 degrees F
Resource:
Electric: How to replace electric water heater thermostats
Gas: How to replace water heater gas control valve thermostat
Identify/ troubleshoot by type of gas control valve

Leaking threads on TP valve

Reseal threads with 6 wraps teflon tape
Probably mean tank is rusting: inspect tank each 6 months
Resource:
Replace tank: How to install gas water heater
Reduce pressure using pressure reducing valve. Read more below
Turn down thermostat temperature: How to adjust temperature
Replace anode rod to prevent rusting: Replace anode

Leaking weld around TP valve

Tank rusted beyond repair: Replace tank
Resource:
Leaking water heater
How to install gas water heater

Closed system/ high water pressure pressure

Install pressure reducing valve and expansion tank (read more lower on page)
Resources

Read about expansion tanks
Read about expansion tanks and closed system
Expansion Tank Installation pdf

Discharge pipe Code


TP overflow tube runs down to at least 6 inches of floor.
Overflow tube must be same diameter as valve discharge connection. Do not downsize pipe into smaller pipe. Overflow tube can have maximum 4 elbows and 30 feet length.
End of overflow tube cannot be threaded.
Tube cannot be lower than top edge of drip pan. Tube must terminate 6" above open drain. TP valve can draw water back into water heater if overflow tube is under water.
Do not cap off TP valve or obstruct overflow tube
Overflow tube cannot have shut off valve installed, or any obstructive valve
TP valve is first line of safety for water heater.
TP valve releases water when pressure or temperature is too high, and prevents possible water heater explosion

Reasons TP valve releases water:

1) Tank is overheating. Action: Open hot tap, and check for overheated water. Adjust water heater temperature. How to adjust temperature  Bad gas control valve thermostat
2) Bad TP valve. Action: replace TP valve. Open TP valve once per year to test and dislodge obstruction. Clean sediment out of tank. How to clean sediment
3) Factory Heat trap nipples or inserts clogged. Action: remove heat traps Read more
4) Closed system caused by check valve, resulting in frequent TP replacement or constant drizzle. Action: remove check valve or install pressure reducing valve. Install expansion tank. Read more about closed system and expansion tank
5) High pressure. Action: put pressure gauge on water heater drain valve. Anything over 80 psi can damage tank. Install pressure reducing valve. Read more

Replacement steps start here

Buy TP valves:
Replacement TP valves at Amazon
Teflon tape at Amazon
TP valve with teflon tape
Wind 6 wraps teflon tape on new valve.

Most new valves already have Teflon tape on threads


Buy TP valves:
Replacement TP valves at Amazon
Teflon tape at Amazon

Step-by-step: How to replace TP valve:

1) Turn off water.
2) Open tub spout to release pressure
3) Turn off power to heater
        Electric heater: turn OFF circuit breaker
        Typical Gas heater: rotate knob to vacation setting, or move knob to pilot position
4)  Open bathtub tub spout on Hot side to release pressure
5) Let water cool
Caution: Make sure tank has cooled before removing TP valve
5) Open TP valve to lower water level.
        Or use drain valve on bottom of tank
        Resource:
        If water heater won't drain


6) Unscrew TP valve counterclockwise using 12-14" pipe wrench.
7) Install new valve and make sure threads have white teflon tape.
Teflon tape will seal threads against leak.
8) Connect overflow tube that was attached to old TP valve.
9) Refill tank with water.
Caution: Do not turn water heater ON unless tank is full of water or it can damage tank 
Wait for water to come out of bathtub spout in full stream before turning on water heater.
When bathtub spout is running, then tank is full. Turn off tub spout.
10) Open new TP valve for a moment to let last bit of air out of tank.
11) Turn on water heater.
       Electric: turn on circuit breaker
       Gas: Rotate knob to previous temperature setting
                Resource:
              How to adjust temperature on water heater

water heater overflow tube
Install overflow tube

TP valve: overflow tube CODE:

TP Valve discharge line code

Overflow must run downward to at least 6 inches of floor.
Overflow tube must be same diameter as valve discharge connection. Do not downsize pipe into smaller pipe. Overflow tube can have maximum 4 elbows and 30 feet length.
End of overflow tube cannot be threaded.
Tube cannot be lower than top edge of drip pan. Tube must terminate 6" above open drain. TP valve can draw water back into water heater if overflow tube is under water.
Do not cap off TP valve or obstruct overflow tube
Overflow tube cannot have shut off valve installed, or any obstructive valve
TP valve is first line of safety for water heater.
TP valve releases water when pressure or temperature is too high, and prevents possible water heater explosion
Resource:
Read about TP valve code

Prevent water heater problems

Expansion tank

Install expansion tank on incoming cold water line to help with constantly drizzling TP when tank temperature must be kept high.
Buy:
Expansion tanks at Amazon
Resource:
Expansion tank installation/ pdf
Read more about closed system and expansion tank
How to increase amount of hot water
Tank pressure

Pressure should not exceed 80 psi.

High pressure can cause:
TP valve leaks
Early tank failure
Plumbing leaks
Shorter life for faucets

Action: Install pressure reducing valve and expansion tank
Check pressure using temporary pressure gauge on water heater drain valve

Resource:
Read about checking water pressure

Buy pressure gages at Amazon
Rainbird 200 psi pressure gauge
BTG 100 psi pressure gauge
Pressure reducing valve

Pressure reducing valve

Install pressure reducing valve when TP fails frequently or when pressure is greater than 80psi. High pressure can damage tank.
Buy:
Pressure reducing valves at Amazon
Pressure regulating valves at Amazon
pressure gauge
Permanent pressure gauge

Install Permanent pressure gauge on cold water line

Pressure over 80 psi can damage tank and shorten life of plumbing fixtures

Buy:
Pressure gages at Amazon
Di-electric nipples

Heat trap nipples can clog and cause high pressure

Nipples can clog and cause hugh pressure and TP release

Replace with di-electric nipples
Heat trap nipples
Buy:
Di electric nipple at Amazon
Dielectric nipples at Amazon
remove water heater nipple
Insulate TP valve

Insulate TP valve, but do not cover TP valve with insulation

Add insulation to TP valve to prevent heat loss.
Do not cover TP lever with insulation

Resource:
9 ways to save with water heater

Additional links
Leaking water heater
Troubleshoot leaking water heater


How to install gas water heater

Other links
How to test element

Find age of water heater
Water heater drain valve
Plastic water heater drain valve
How to replace water heater drain valve

240 V Intermatic water heater timer
Compare box timers
Compare box timers

Compare all water heater timers
Do it yourself
Do it yourself water heater

Electricity from pole to breaker box

How to wire Dayton OFF-delay timer

New water heating ideas

9 ways to save with a water heater
Expansion tank pdf

All costs are energy
Pro-n-con tankless water heater

Install a subpanel

Cost to run electric water heater

How to install gas water heater
Troubleshoot Rheem tankless

Troubleshoot Bosch tankless
Intermatic parts
Intermatic trippers and parts
Gas and electric water heaters 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
Troubleshoot gas water heater
Troubleshoot electric water heater

E-mail: geno03245w@gmail.com
My response might end up in spam folder, check email folders
Site map
Follow newest idea on twitter
Privacy policy