New Condensor Boiler - hot water not so hot

[Dave-Sandra]

Hi, I had a new condensing boiler installed in June to replace my 20 year old Potterton which was working fine but was very old. After it was installed it was noticable that the hot water was not heating up as well as before. It takes about 3 hours to get a very hot flow of water out of the hot water cylinder in the loft which it would only take about an 1.5 hours before! The boiler installed is a Gloworm that is suitable for my type of house and bigger so that side of it is ok but the plumber who installed it thinks that the problem may lie with the hot water cylinder and scale. before i have to pay our for a new installationof a cylinder (around �1k) can anyone suggest further checks they should do as they have not done much apart from checking the cylinder thermostat that seems to be fine and telling me that the water seems hot in and out of the hotwater tank by feeling the pipe? Could they flush out the pipe going into the cylinder etc?

[gasman]

Hi, I am quite suprised that the cylinder was not upgraded to comply with the energy efficiency regulations when they installed your boiler because this should have done. Any how it obviously has not been done why i cant say !!! but i do not think scale is the problem considering all was well before the new boiler was installed. I would think that it is either bad plumbing techniques and air is accumilating in the feed pipes causing a slow delivery and will need to be bled out or blasted through, or a pump failure or the by-pass has not been set correctly and my need adjusting accordingly. Also the boiler thermostat may be set too low or the cylinder stat set too low both should be set to 60*C.

[Dave-Sandra]

Thanks Gasman, this is still ongoing and the plumber is acomming around on Wednesday to look at it again.