We want to reduce our carbon output but are pulling our hair out trying to understand the best heat pump system for us. We are in a well insulated 3-bed 1930s semi and our current oil heating system costs us around £600/year as we only run it a few hours a day in the cold season. We’ve a 4kW PV array on the roof that does much of our hot water across the year. Our heat loss survey suggests an 11600kWh requirement for our 85m2 home.
We’ve had a few quotes for a heat pump system which essentially split between keeping our microbore piping (using a buffer tank) and replacing the entire system.
Before BUS, it’s approx:
£14,000 to have a 55 degree system installed that keeps the microbore (8kW Mitsubishi Ecodan & cylinder, buffer tank, controls & a couple of rads) and;
£20,000 to have a whole new system - tip-top 40-45 deg 6kW Veismann vitocal, cylinder, controls, new 28mm piping & 8 new rads.
Both installers are keen on including heat pump monitor equipment at cost.
We have money saved and are keen on stopping burning stuff, but the biggest stumbling block is that no engineer is able to give us an estimate of running costs beyond that based on the heat loss survey. We appreciate that a new system will cost money but would the £13,000 system be cheaper to run than the £7000 one, and would either be comparable to the £600 annual cost of our oil?
I’ve read around the forum and I’ve watched heaps of videos but there doesn’t seem to be a running cost calculation tool that I can find.
I’d really appreciate your thoughts. Thanks.