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Our heating bills are a little hard to figure out, we've not long moved in but we're paying about £300 a month for Gas and Electric and as mentioned its a split system with oil for part of the house, I would estimate we're using about £80 of oil a month just for heating (based on a refill we did and how much we're getting through on the oil monitor jobby)
I'm a little confused by the 22 rads, I count 15 and that includes one additional one in a bathroom that doesn't have one at the moment (its just a toilet/sink that we'll convert to shower room).
"Thermostat" is via the oil and gas boiler which are set to pretty low - range from 1-7 and they are on 2.
andos-
I'd be asking what £7k in "ASHP materials" is. Anti freeze valves, copper, basic controller, low loss header, pumps etc can't be £7k, especially if they're not re-piping.
I'd also get someone who knows what they're doing to do a proper heat loss survey + projected heat loss calcs for post-insulation.
dbr
Your MCS heat loss calcs done by the ASHP supplier most likely don’t factor in any prospective fabric upgrades that you’re planning, and a 1930’s detached 4-bed will be a thermal nightmare until it’s insulated properly so will need a huge, thirsty and expensive ASHP system to keep warm.
How much are your heating bills currently? What’s your thermostat set to?
Post up your ASHP quote.