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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Lack of hot water https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1160764922 Message started by Teresa on Oct 13^th, 2006, 7:42pm

Title: Lack of hot water
Post by Teresa on Oct 13^th, 2006, 7:42pm

Hi,

I have a standard gloworm gas boiler that heats water for both heating and water. The hot water is then stored in a tank.
The heating works absolutely fine, but i can't get more than about 5 mins worth of hot water. If I keep the central heating on, I get hot water fine, but not without. I have replaced thermostats, 3 way valves and the electrical contrl panel, all to no avail. Any ideas?

Title: Re: Lack of hot water
Post by thescruff on Oct 16^th, 2006, 10:50pm

Air or scaling in the primary pipes, would be the first port of call.

How old is the pipework and cylinder, and what boiler is it.

Title: Re: Lack of hot water
Post by Teresa on Oct 17^th, 2006, 5:06pm

Thanks for the reply.

The pipes and the boiler are pretty old, but I have them full of fernox, so they shouldn't be too cruddy. I bled the whole system down yesterday and think I may have had a small airlock from when I replaced the 3 way valve. Hot water seems OK today...watch this space.

Title: Re: Lack of hot water
Post by thescruff on Oct 17^th, 2006, 11:37pm

Are you putting the valve to the manual position when you vent the system.