The Housebuilder's Bible 13 (The Housebuilder's Bible: 13th edition)

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High risk is defined in Appendix C and includes most of inner London and central Manchester, defined by postcodes. Turn back their taunt on their own heads and give them up to be plundered in a land where they are captives.

This ratio (heat in:power used) is known as the Coefficient of Performance or COP, and when you start getting versed in the world of heat pumps you will hear the term COP (or sometimes SCOP, where the S stands for Seasonal) used a lot.Part F requires that ever habitable room has a window somewhere that can be opened (even if its in an adjoining space) or at least ventilated like a bathroom or loo. It seems to refer to the whole house openings:floor area ratio, but following on from the main calculation there is a supplementary ratio which applies to bedrooms.

Quite why central Manchester is deemed to be high risk but central Birmingham moderate-risk is not explained, but let's not get bogged down here. The first column shows the proportion of glazing you can have in the house or flat as a whole, relative to the internal floor area of the house or flat. It’s a technology that has energy-efficiency burned into it and, used well, it can achieve enormous energy savings with the potential to make the switch to electric heat a lot more palatable.

I soon settled down and kept it with me to pick up a paragraph here or then as I found time and found both approaches worked. Heat pumps are much more common now and will be the norm as soon as gas boilers are banned (If they are banned - currently it looks like 'hydrogen ready' boilers might be acceptable). If then you have been raised with Christ, seek the things that are above, where Christ is, seated at the right hand of God.