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And onto the efficiency figures achieved at the power station we can add transmission losses shipping the electrons through the cables to the point of use. There are losses in the gas grid of course but far smaller.

Coefficient of performance. SCOP seasonal coefficient of performance. COP of 3.5 would equal 3.5kW heat energy generated for 1kW electrical energy input. The colder the day the less ambient heat in the air to be harvested the COP reduces.

Can a gas boiler? Yes, if the gas is up to spec and there's enough of it. Same with a heat pump, the colder the day, the lower the COP, and that's where design and understanding come into it

If you haven't had training, get some.

One of them

No, only the certified test figures. What's the refrigerant in your annex unit, who is the manufacturer?

The Carrier Aquasnap 290 can hit 75 degrees but like all heat pumps keep it as low as possible. Insulate, carry out an accurate heat loss then decide.

Seems obvious it's circulation: Boiler stat is ok, boiler doesn't kettle and the pipes at the pump are too hot to hold so boiler is neither too hot or not hot enough. If the plumber used the pump valves to change the pump and they operated alright it's not the gate stuck in a semi closed...

I understand now, I thought when writing my you were in the third person. The Profile, which I thought you were writing about, has the date of casting on the hex which would give the age.

Why?

I'll let others give their opinion of WHICH, Worcester etc as I work for Vokera. The post is whether a second hand boiler with no warranty is a good choice to save a grand and looking at things that way £700 for 5 years warranty is £140 a year whereas BG cover is likely to be £360 per annum on...

Put it this way, for £700 inc VAT you can put in a Vokera Vibe Max 26C, large bore stainless heat exchanger, larger that the Viessmann, with retarder but no restrictive elbows and constrictions. It’ll modulate to just below 3kW, has dual temp weather comp, OpenTherm, three preheats, wi-fi ready...

Q1: Is risk cost >£1000 A: Don't do it Q2: Is risk vlaue <£1000 A: Do it

CBW is correct, the tube should be installed level as the inner flue tube has an incline falling back to the boiler built in. If there's ever a reason to get a ladder up the side of the property try to lift the terminal end upwards a little, even if it means chipping out a bit of brickwork. The...

Look in a radiator catalogue of a style similar to your own. Do you need it to be that accurate?

Your immersion heater might be switched by the heat pump control or it might be switched separately, you need to find out which. Follow the cable back from the immersion heater or better, ring the installer or his electrician. If the immersion heater is controlled by the heat pump unlock the...

Go to a bathroom shop, not B&Q or Wickes.

https://uk.trustpilot.com/ Type the name of the company you want to check into the search bar.

I work for Vokera and keep an eye on feedback to the review site. If you ask me if it reflects reality I'd have to write, spasmodically. These are customer reviews, some manufacturers ask their installers to review on them. Some manufacturers ask the end user to place a review if they're...