Strange gas pressure drop

[dl18sh]

Just to clear up, the engineer did come back to me and confirm he missed a decimal point. The gas rate was 3.7m3h

 

[dl18sh]

Sorry I couldn't resist lol

The gas supply is almost certainly well undersized if its 22mm at the meter.

But if they set D.0 to 15 the boiler will never run hard enough for it to matter and they will have more efficient heating that also heats up quicker.

The boiler is ridiculously oversized

The previous owner has set up this way for some reason. I suspect because of the underfloor heating in the open plan kitchen, which uses the boiler rather than electricity. There are 2 pumps, one to the radiators, hot rails and hot water cylinder etc and the other to the underfloor heating.

Just wondering what is D.0?

 

[CountryFan]

Just wondering what is D.0?

Heating partial load in the book, just another way of saying range rating. In layman’s terms, tell the boiler what Kw rating you want it to run at based on each rad/UFH Kw rating.