My property is on rent now and the new tenants have reported a strange problem which I and 2 previous tenants never noticed in the last 5 years. They first complained the boiler was only working intermittently. Luckily I had extended warranty with Viessman and they came and checked it out and found no fault. Then the tenants brought their own plumber and contended the house has a cross connection between the hot and cold water pipes (for domestic water, not heating, I hope). This is the test they said was done:
"It seems like there’s a crosslink between a hot water pipe and a cold water pipe somewhere in the property. The engineer suggested it might be from one of the showers or the bidet.
We had the kitchen tap on running hot water and the engineer cut off the hot water pipe going from the boiler. At this point the water should’ve stopped but instead, cold water started running. This means that the hot water is mixing with the cold one and it will not be scorching hot. I do believe it is hot enough though for normal household use"
Is this how combi boilers piping is supposed to be, or is it a closed loop system where closing the hot water supply would force cold water through the hot water circuit?.
Thanks.
Riz
"It seems like there’s a crosslink between a hot water pipe and a cold water pipe somewhere in the property. The engineer suggested it might be from one of the showers or the bidet.
We had the kitchen tap on running hot water and the engineer cut off the hot water pipe going from the boiler. At this point the water should’ve stopped but instead, cold water started running. This means that the hot water is mixing with the cold one and it will not be scorching hot. I do believe it is hot enough though for normal household use"
Is this how combi boilers piping is supposed to be, or is it a closed loop system where closing the hot water supply would force cold water through the hot water circuit?.
Thanks.
Riz