Well, carried out a heat loss survey of my house using an app supplied by “heatpunk”. Took me longer to measure the rooms, radiators, and windows than to draw the plans and work through the app. The down side is the app recommends a 16kwh ASHP and that I replace ALL my radiators gulp.
Once again, this is for a full ASHP not a high bryd system but it suggests I will be using my combi boiler a lot.
Now I have used a few different bits of kit, youtube video advice and based on these I have estimated the size of pump to be between 9 and 16 kwh obviously something isn’t correct.
My concerns about going too big is the efficiency of the unit. If it’s too big it tends to switch off and on regularly and this reduces the efficiency quite a bit. This decreases efficiency and increases cost, so not ideal.
Going by one of the “rule of thump” videos on you tube the total energy use can be used as a guide to the pump size. I used 16,500kwh of gas last year and the rule of thumb method suggests a 6kwh heat pump with a COP of at least 3 would generate 18,000kwh over the year, more than my 16500kwh used last year.
So somethings not right somewhere.
Im in the process of agreeing a deal with an installer to supply my pump, battery and solar. He is suggesting a 13kwh pump. I initially went back to him and suggested a 10kwh instead. I am now, more than likely, going for the 13kwh. Everything is telling me the 10kwh would be enough but!!!!!!!!!!
The only person who got all his work done by Friday was Robinson Crusoe.
Anything i post over three lines long please assume it is an article lol.