For those interested, this technology (coupled with removal of gas, electric water heater and PV on roof x9 panels), has given me 80% reduction on my bills. Second to this (but most important) my son has cystic fibrosis and this technology has allowed a heated environment with clean air without dangerous wet particles.
Thirdly, I was able to knock down most of my ground floor internal walls because… no need for radiators.
A truly superb technology.
David Lee, Director at Clarion Housing Group