A few weeks ago British Gas serviced the boiler. Not my idea. Nice young
lady who left me a leak on the Magfilter.
Since the service we have noticed that the house takes a LOT longer to warm
up. Before the service the place was warm in a couple of hours. After the
service the house took about five hours to get warm - with the boiler
running of course. The rads were hot, but not as hot as before the service.
I suspected that she had turned the temperature on the heating side of the
boiler down, but was to lazy to check as the boiler is in the loft.
Today I had a look. From 3/4 she had turned the temp down to 1/2. She did
not tell me that she had done this. The temp setting had been on 3/4 since
the boiler was installed eight years ago.
I turned back up to 3/4 and the house was warm in no time, rads very hot.
Would I be correct in thinking that two hours running on 3/4 uses less gas
than five hours running on 1/2?
I never thought to take a meter reading.
Do your turn the heating off after two hours normally?
In reality it depends on several factors... If its a condenser, then
they gain in efficiency as the return temperature falls. So just warm
enough to do the job will typically get best results. Most boilers these
days can adjust their output power to suit the load (modulation), but
raising the flow temp can also raise the minimum heat input to the
system - so on milder days may promote more cycling of the boiler. That
will also reduce efficiency a bit. (although on modern boilers its less
of a problem than on old systems without pump run on).
The ideal situation is the boiler just ticking over supplying heat at
the same rate the property is losing it - that will give good comfort
and efficiency. However the problem with that approach is on cold days
it will struggle to get the place work quickly. (tis why posh systems
use weather compensation)
I have no means of measuring the flow temp.
We like to sleep in a cool bedroom, say 18C or cooler.
The way she set the boiler took 5 hours to warm the house by 4 degrees.
Setting to 18C at bed time would still take 5 hours to reach 22C.
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