cold tap is warm when heating is on

[mrtapir]

hello, my house has a conventional open vent system. whenever the heating is on, the cold tap in the bathroom (which is fed from the storage tank in the loft) comes out hot. any ideas what this could be?

cheers, Rich

 

[seco services]

heating pipe running next to the supply for the tap

 

[mrtapir]

ah so its just the heat from one pipe transferring to the cold supply? smart move! anyway thanks for the advice

 

[TicklyT]

Seco is probably right, but if it doesn't run cold after running off some water, there may be other problems causing the heating system to heat the cold storage cistern.

Plastic cisterns aren't designed to handle hot water!

 

[mrtapir]

Seco is probably right, but if it doesn't run cold after running off some water, there may be other problems causing the heating system to heat the cold storage cistern.

Plastic cisterns aren't designed to handle hot water!

how long are we talking for running off, like a few litres?

 

[seco services]

yes shouldn't take much.
you can check the tank in the loft that the waters cold.

 

[mrtapir]

ok thanks guys