SteamyTea

Right, there are a few of things. Is it a new build, if so, may still be drying out. How high is the flow temperature and do you keep the heating in permanently? Power is kW, kWh is energy, it is energy you pay for, not power. Do you use a lot of hot water, how hot is it stored at. How well insulated is your house, floor included? How does it match your heat loss calculations? It is 7⁰C down here on Penzance Promenade.

You could look at dMVHR. Basically though the wall extractors with heat recovery. May need two, and a cooker hood in the kitchen, lounge, diner. Have you considered summer cooling? This could change the whole ventilation design somewhat. Not that it is really needed down in the SW. the sea keeps the temperatures suppressed.

Should be easy enough to calculate it from first principles. As long as you know all the material's properties, and their surface area ratios, and the angle of the roof, should be easy enough to calculate.

Isn't that called what Governments, and social scientists do? If I want to scare people, I tell them they have a 5% chance of dying, not a 95% of surviving, and never mention the activity risk of death.

People need to be told that during primary school science lessons. If 8 year olds cannot be taught how reducing a flow temperature, or a flow rate, will reduce energy transfer, then school teachers need a kicking, not a (expletive deleted)ing pay rise. This reply was partly prompted by two women in the cafe talking about increasing the boiler temperature in their homes because, and this is their words 'it saves money', 'that but on the news was bollocks'.

Not always as simple as that. LPG (and combustion bi products) is very corrosive. So care has to be taken with choice of which motor, induction and exhaust, is used.

I don't object to a smart meter and get begging letters asking me to have one fitted. Shame after 2 attempts they (EDF) cannot get it organised. They cannot even organise the smart meter at my 'vunerable' Mother's home to be replaced. So shall just have to wait till the E7 radio signal is switched off and EDF are forced into action.

Welcome So am I, I don't think damp is a Cornish problem, crap housing stock is though. As other have said, you really need MVHR, just a matter of designing it in from the start. As you are having UFH, what floor U-Value are you designing to? ICF seems popular down here at the moment, we did have a member that was working for a local company, but he seems to have vanished. Can't remember who it was now.

I think it is illegal to tamper with a revenue meter, though they may have a connection that allows for this. It may use the smart meters wireless connection, but they are proving to be unreliable.

They are perfect for putting bicycles against. And every Frenchman has at least 2.

We have been hearing for months now that we need to turn down the boiler flow temperature. Now there is a proper website to help. Anyone fancy giving it a go to see if the advice is sensible/practical/appropriate. Not having gas I am beyond help. https://moneysavingboilerchallenge.com/

I would think again, maybe add another 0 on, unless you want something very noisy and unreliable, or very small, like a not enough to run a kettle.

Yes they do. Worth checking the power as it may only be 1 kW. You also need to know how much control you have over the supplementary heater, they are often used to get the DHW up to 70⁰C.

Supplementary heating, usually electrical. It is 90‰ (or whatever) if the time, so that leaves just shy of 100 hours a year when extra is needed, or the house is a bit cooler.

Is that for a day, 24 hours. Or do you mean 6 kW.

That is the secret of propriety software. Why I start from first principles and make up my own spreadsheets. They are only glorified graph paper that we used at primary school to do our sums on.

So you got to cut your power for two hours at tea time?

To oversell a heat pump maybe.

Have you taken the air films and PSI values into account? Air Film PSI (thermal bridges) could soon add up on a complicated shape. SAP-2009-Appendix-K.pdf

Sounds like it was properly designed, by a real engineer.

It takes the long term averages, which even accounting for climate change, only have a small error of margin when looking at the whole year. There would be a difference if you looked at a 60 year old database of the previous 30 years of data and compared it to the last 30 years. But not as big a difference as you would think. The variation is what changes most i.e. how big a difference between the same weeks in each data set. One advantage of PV generation is it tends not to be put in poor locations i.e. rainforest and high rise cities. It also has very accurate predictions of times it can, and cannot, generate i.e. day and night. Wind generation predictions are also very reliable.

I so wanted to mention something rude and totally inappropriate.

What you really need to do is get more informative statistical numbers. So if you are happy with an hourly granularity, plot usage and generation for each hour of the day. That way you can see which loads you can shift to best match PV output.

The hosepipe ban may have hurt the roses.

How often do they update the database. https://www.cornwalllive.com/news/cornwall-news/cornwall-skip-hire-boss-operating-7911527