Max efficiency is at minimum power output. So there's always a conflict between providing enough power quickly enough & maximising efficiency.
that would use more gas due to reduced effieincy & cause overshoot, which of course uses more gas.
When it's mild out the primary temp can be kept lower and burner power reduced to improve efficiency.
the same way it always operates, except at reduced burner output & reduced fan speed
Most heating season days don't need full power output.
NT
But then they'll all be disappearing in a few
Don?t believe that with house heating. They might be replaced by electrical heating from nukes tho.
Fuel was cheap in the 1970's. New houses were built to the standards that were deemed acceptable at the time.
In the summer, you don't need much hot water, so that's what the immersion heater is for, also when leccy was much cheaper.
They didn't go up the chimney, the heat warmed up the bedroom.
Nowhere near as inefficient as believed, and very, very reliable and long-lasting (unlike todays junk).
Interesting to know why you think you need less hot water in the summer.
If leccy is cheaper to heat water, why do it by gas ever? And why not heat the house with leccy too?
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