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Don't know technical things... It's set to max on the boiler for CH and about 3/4 for the hot water. The old one was max for both, but struggled to get the heat up to the top floor, then was breaking a few times for different reasons, so we got the new one then. We put the valves on whatever...

10 year old Worcester 350 went out. Worcester 37cdi went in. I expected slightly higher bills due to it heating the house better especially the top floor (just two bedrooms, and they were ok previously just took a long time to heat).... Just not triple?!

I could imagine keeping the house hotter could increase it by say 50% maybe even double, but over 3 times the usage? The system has a timed thermostat now too which it never did.

We have an old 5 bed semi detached. Prior to Feb 2012 we were using average 200 units of gas a month. Since Feb 2012 we have used average 650 units gas a month. We had a bigger combi boiler installed, which heats the two top bedrooms better. We have had the house slightly hotter in the...