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Leaking Ariston 2kW Water Heater.

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A customer complained that his Ariston unvented water heater that he installed himself had leaked water. The model is a 3100306 undersink type. He said that water was leaking from the heater inside the house in his utility room. I asked about the discharge pipe and he looked blank. He said that the pipework took care of the hot water pressure build up. The unvented heater did not seem to have a pressure/temperature relief valve, tundish or pipework to the outside. Nor does it have a pressure reducing valve. A warning label on the front says that if water leaks out to turn off the heater and call an engineer.  He poo pooed that idea. Will it eventually blow up or flood the house?

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    Grumpy: 
     

    Whilst I hesitate to disabuse Broadgage, I think the instructions require a certain length of pipework (defending on dia) between the heater and the tap. When teeing off the cold main a non return valve is required and this is usually quite close to the heater as you tend to use the cold supply to the sink. 

     

    If there’s a non-return valve then an expansion bottle is required, as well as the relief valve.

    The what if‘s include, what if someone turns the stop tap off, but not the heater and what if a pipe freezes and has a plug of ice in it, then the water cannot push back up the pipework.

    One customer was installing a heater himself and asked what to do because the pipework wasn’t going to be long enough, after a discussion he put a loop of pipe behind the cupboards to get the required distance from the tee.

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  • 0

    Grumpy: 
     

    Whilst I hesitate to disabuse Broadgage, I think the instructions require a certain length of pipework (defending on dia) between the heater and the tap. When teeing off the cold main a non return valve is required and this is usually quite close to the heater as you tend to use the cold supply to the sink. 

     

    If there’s a non-return valve then an expansion bottle is required, as well as the relief valve.

    The what if‘s include, what if someone turns the stop tap off, but not the heater and what if a pipe freezes and has a plug of ice in it, then the water cannot push back up the pipework.

    One customer was installing a heater himself and asked what to do because the pipework wasn’t going to be long enough, after a discussion he put a loop of pipe behind the cupboards to get the required distance from the tee.

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