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That would depend on the size and heating capacity of the water heater. You need a temperature and pressure relief valve ( not a pop valve which is pressure only) with an ASME rating at or above the input rating on the water heater.
For example: a domestic, gas fired, 40 US gallon water heater might have 36,000 BTU per hour input rating. The pressure relief might be set to 125 or 150 psi, but the temperature rating would have to be at least 36,000 BTUH. A 3/4" T&P relief valve typically is rated at 100,000 btu per hour.
If you are dealing with a larger unit ( a 50 or 60 gallon tank, or a cyclone ) you will have to check the rating plate to get the proper relief valve.
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How much pressure does a water heater put off when it explodes?
You would need to specify the size of the heater
Tankless Water Heater?
form_title= Tankless Water Heater form_header= Repair or install a tankless water heater in your home! Do you need a tankless water heater repaired or installed?*= () Repaired () Installed What size water heater do you need?*= _ [50] What is your budget on the water heater?*= _ [50]
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Depends what size your pipe is
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what size water heater for 3000 sq ft 4 bathroom house
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Usually 30 amp
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A single tankless water heater will not cope with all that.
Water Heaters ?
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At what size is a hot water heater considered a boiler?
NONE a boiler is a boiler and a water heater is a water heaterSEE ASME section IV or the NBBI
