Set Square wrote:

In an earlier contribution to this discussion,
The Natural Philosopher wrote:



The booer will turn itself off. It has its own stat on teh water temp.

??????
boiler?


ISTR that you said something similar in an earlier thread. Whilst true, it
still wouldn't satisfy the new regs because it will come on again when *it*
cools down - even if no heating zones are calling for heat.



No, not when IT cools down, when the water circulating through it cools
down, and if you have insulated pipes and no demand, that will be an
awfully long time. In my case well over ten minutes to overcome the
thermostat hysteresis. Then a quick minute burn up to temp, and a ten
minute gap again.

In fact since I superlagged the CH pipes in the attic, its even longer now.