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TP valve Discharge pipe Code
Water heater TP valve is last resort safety device that prevents water heater from exploding
Prevent explosion
TP valve code
Water heater TP valve
If thermostat fails, it will cause run-away heating inside tank
When water inside tank reaches boiling point, a steam explosion occurs.
This will blow the pipes off water heater, or water heater explodes causing massive damage.

To prevent this, a TP valve or temperature-pressure-release valve is installed on each water heater
Instead of explosion, the TP valve releases hot water and cold water automatically refills tank, causing temporary cooling
The cycle of overheated water and TP release continues until water heater is repaired

Properly installed TP valve is critical for water heater safety
Applies to all water heaters/ gas, electric, tankless, condensing, oil-fired, solar, hybrid etc
Resources:
Review solar
Review hybrid
How to install electric water heater
How to install gas water heater

Leaking water heater

TP temperature pressure release valve

Overflow must be same size as TP valve
 Copper
 CPVC
 Galvanized
TP overflow tube runs down to at least 6 inches off floor.
Cannot terminate near or on electric wires or junction box. Released water cannot contact person.
Pipe must be approved for hot water distribution (cannot use garden hose or PVC)
Overflow tube must be same diameter as valve discharge connection. Do not downsize pipe into smaller pipe.
Overflow tube must pitch downward at all points. If tube has horizontal run, then it must pitch downward.
Can have maximum 4 elbows and max 30 feet length.
End of overflow tube cannot be threaded. Must be protected from freezing, and cannot be concealed from view.
If water heater is sitting inside a drip pan, overflow 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.
Tube cannot be inserted into a drain. For example under counter water heater or hybrid water heater may be installed in location that does not have available floor drain. The TP tube can terminate 6" above a metal can. But homes can suffer considerable damage if thermostat fails and TP begins releasing hot water.
If overflow tube is terminated in a drain, there must be air gap to prevent drain water from being sucked into water heater.
It is always best to have a floor drain, or a catch pan with 3/4" line to outdoors, or terminate the TP overflow outdoors
Do not cap off TP valve or obstruct overflow tube
TP valve must be installed so probe inserts directly into water heater tank. Install in port located on top of water heater or side of water heater near top of tank. Cannot be installed in lower part of tank, since hot water rises.
Overflow tube must connect directly to TP valve
Overflow tube cannot have shut off valve installed, or any obstructive valve
No restriction, reducer coupling or valve can be installed on overflow tube
TP valve is last line of safety for water heater.
Pressure valve rating cannot exceed 150 degrees F for residential water heater
Household water pressure cannot exceed 80 psi, or TP can begin leaking water.
Resource:
How to replace TP valve
Buy TP valves:
Replacement TP valves at Amazon
Teflon tape at Amazon
Overflow Tube is required
Released water cannot contact person.
TP valve code Add 6 wraps teflon tape when installing or replacing TP valve
Temperature probe must be inside water heater
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
Keep extra TP valve on hand when doing this in event the TP continues leaking
Caution: Keep Feet away from hot water coming from discharge tube!
Resource:
Leaking water heater
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
TP valve with teflon tape
Standard 3/4" pipe thread



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
1/2" TP valve 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

 
Use 6 wraps teflon tape
☑ White for water lines
☑ Yellow for gas lines

Buy
Teflon tape at Amazon

Buy:
Pipe wrench at Amazon
Channel locks

Resource:
How to remove rusted element
replace anode rod
Inspect anode each 2-5 years
Buy:
Anode rods at Amazon

Resources:
Replace anode rod
How to maintain water heater
Pressure reducing valve
Pressure reducing valve
Pressure over 80 psi can damage water heater and household plumbing
Buy
Pressure reducing valve

Resources
Identify water heater valves
Troubleshoot water pressure
Water pressure gauge

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

Resources
Identify water heater valves
Troubleshoot water pressure
Automatic water heater shut off valve
Prevent flood
Automatic water shut off valve
Buy:
Water detectors at Amazon
Automatic water heater leak shut off at Amazon

Resources:
Leaking water heater/ steps

Water heater circulation system

Buy:
Grundfos at Amazon

Resource:
How to install recirculation system
Sharkbite pressure gauge
Sharkbite pressure gauge

Buy:
Sharkbite pressure gauge

Resource:
Water heater valves
HOT side Sharkbite flexible water heater connector
HOT side Sharkbite flexible water heater connector

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

Resources:
How to install electric water heater
How to install gas water heater
Leaking water heater
COLD side Sharkbite flexible water heater connector
COLD side Sharkbite flexible water heater connector

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

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

Buy:
Impact wrench at Amazon

Resources:
Replace anode rod
How to remove short water heater nipple
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
Buy
Gas water heater thermostats at Amazon

Resources:
How to replace gas water heater thermostat
Add another thermostat to water heater
Troubleshoot gas 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
Buy:
Water heater thermostats at Amazon

Resources
How to replace electric water heater thermostat
Add another thermostat to water heater
How to wire thermostats
Marathon water heater thermostats
Two water heaters
Troubleshoot electric water heater
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

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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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