What could be wrong with my boiler?

G_M

jinglejones wrote: »

Oh and thermostat is not covered, and its on the bottom of the tank.

I'm also heating the water through the downstairs system, not the immersion because I was told heating with immersion is the expensive way to do it. I have, however switched the immersion on AS WELL at times, and it doesn't seem to make much of a difference.

Do you think changing the temp on the boilers will help?

Find and check the emmersion isolating switch Clutton descibed.

Try checking the emmersion is working by heating the tank JUST via emmersion (ie turn the downstairs boiler off or just to central heating). You may not improve the quantity of water heated but you'll establish if the emmersion works!

As an added experiment, try switching the dual emmersion switch the other way - just in case it's been wired in back-to-front!

ps - you're right that generally emmersions are more expensive than gas boilers, though of course it depends what gas and electricity tariffs you're on, and whether you're running central heating at the same time.