How to replace a pressure relief valve?

Why would you replace a pressure relief valve?

A pressure relief valve must let the water run only when the water heater is heating. If not, you need to replace it.

Before starting, don’t forget to control the pressure water. The pressure has to be fewer than 5 bars. If the pressure is above 5 bars, you may install a pressure regulator

To replace it, you need:

• A PTFE tape
• A seal 20/27
• A pliers crescent wrench
• A basin
• A wipe

Steps to be followed :

• One day before your intervention, cut off the water heater power supply before taking a shower. You will completely drain the hot water to avoid any risk of burning during your intervention
• Turn off the water valve then open your hot faucet to break the pressure into the water heater. The water must stop running. If not, your valve is not waterproof and you need to replace it
• Turn on the pressure relief valve and let it open
• Remove the pressure relief valve nut and unscrew it 2 turns
• You have two solutions:

• The first one, the most advised, is to let the water heater drain out before unscrewing the pressure relief valve: it may takes several hours
• For the second solution, take an additional basin
• Unscrew slowly the pressure relief valve until the flow stops. When you remove the pressure relief valve some water may run intermittently
• Remove the old PTFE tape
• Install the new PTFE tape clockwise. Your seal has to be thick to be waterproof

Remove the old pressure relief valve then screw the new one fast. When you remove the pressure relied valve, some water may run out.

• Screw the pressure relief valve as the former one
• Install the new gasket and tighten the nut
• Turn off your hot water faucets
• Open the valve slowly and check if there’s any leak again. If there’s any sign of leaks, you can totally turn on the valve
• To displace the air present inside the water heater, turn on the faucet intermittently.
• Check constantly if if there’s any when your water heater is filling
• When the air is displaced, turn off the faucets and check again if there is any sign of leak.
• Don’t forget to turn on the water heater power supply and put your DSC relay in “Force Armed” to get hot water. The DSC relay will switch automatically on the next use

Where can you find the products on the website?

You will find all the pressure relief valve models on our website