Thrush

iTrader: (1)

Right, here's the set up;

Boiler is a Potterton Puma 80e combi thing. I have several rads, all of which get hot when the heating is on, a tap in the kitchen that flows hot water when I do the washing up, and a bath/shower upstairs (regular bath taps with shower head, no power shower or anything) and a bathroom sink - but they don't get hot!

Actually that's not strictly true. I turn the hot tap on on either the sink or bath and after a little while the water comes out hot. But it doesn't stay hot. It goes cold, sometimes after 5 mins, sometimes after much less. IT often stays at the same pressure, and sometimes the pressure backs right off to just a trickle. Then it will get hot again, for it to run cold only a min or few later.

For example, I just had a shower. After waiting for 60-90seconds, the water goes from cold to warm. Approx 2 mins for it to be "proper" hot that you can shower with. It stayed hot for 3 or 4 mins, then goes cold - same pressure. So I turn it off. Shower gel, blah blah, wash my nuts, blah blah, run hot tap. Low pressure and cold. wait another couple mins, pressure builds, water gets warm then hot, then cold, then hot, then cold. Great.

After shower, 20mins later, I go back into bathroom, and run the hot tap on the sink. Cold! 60 secs it's luke warm, another 30 or so it's a decent warmth. Running the tap for another 60 seconds and it's gone cold again!

But I haven't noticed this downstairs at the sink - that takes a min or two to warm up, but once hot it fills a full washing up bowl no problem.

WTF?

turbo_3dr_tommy

could have a lazy pump or could be sludged up inside

Steve the Plumber

iTrader: (11)

Either a temp sensor, sticky divertor control assy or a scaled hw heat exchanger.