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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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    Sparkingchip: 
     

    Grumpy: 
     

    You don't state the size of the heater but under 15l doesn't require G3, notification, blah blah. Indeed the pipework can take care of the expansion but you have to have enough of it. I have found that the insulating FI supplied are a leak prone PIA, is that where the leak is?

    I agree with Grumpy.

    The pipework can deal with the expansion as in stopping hot water coming out of the cold tap so long as there’s three metres or so from where the water heater is tee‘d off, as Broadgage says you need to follow the instructions, it sounds like the customer hasn’t followed the instructions and has not installed the pressure relief valve, so may have created issues that need resolving.

    I was waiting for your reply Sparkingchip. I knew that you were experienced in these matters. What I don't understand is how rigid copper pipe and water can accommodate the expansion. Water can not be compressed we are told, and the pipe is not expandable. Please explain.

     

    Thanks,

     

    Z.

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  • 0

    Sparkingchip: 
     

    Grumpy: 
     

    You don't state the size of the heater but under 15l doesn't require G3, notification, blah blah. Indeed the pipework can take care of the expansion but you have to have enough of it. I have found that the insulating FI supplied are a leak prone PIA, is that where the leak is?

    I agree with Grumpy.

    The pipework can deal with the expansion as in stopping hot water coming out of the cold tap so long as there’s three metres or so from where the water heater is tee‘d off, as Broadgage says you need to follow the instructions, it sounds like the customer hasn’t followed the instructions and has not installed the pressure relief valve, so may have created issues that need resolving.

    I was waiting for your reply Sparkingchip. I knew that you were experienced in these matters. What I don't understand is how rigid copper pipe and water can accommodate the expansion. Water can not be compressed we are told, and the pipe is not expandable. Please explain.

     

    Thanks,

     

    Z.

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