I have 5.1kWh PV setup across various aspects/roofs generating about 4300kW per year. (only been installed 10 months)
DHW and heating in our 3 bed semi comes from a 3 year old Vailant Ecotec Combi boiler across 8 radiators on 3 levels (ground, first and loft conversion). The boiler has a 10 year warranty… so I don’t expect any problems any time soon.
Currently have no EV or battery, so i’ve got tons of PV going spare… I currently export about 75% of what I generate.
I’m wondering what long term and financially viable options I have around heating and DHW?
First off I thought about a ASHP in the dining room to provide a little heat and air con… wife ruled out having an ugly office-type aircon thing on the wall!!
So maybe go down the storage heater / heat-pump route?
But the problem here is I have no internal space in the house to fit a large header tank.
Only place I could remotely think is at the side of the extension, outside. So build a brick surround for it. But will it be insulated enough to reduce heat loss and as its totally the opposite side to where the combi is, will running 10m of piping cause issues?
As I write this I just get the feeling i’m looking for a project for a projects sake?
I’m really not sure it will be cost effective to replace a 3 year old combi with something else just to make use of some spare PV.
Unless you can persuade me otherwise? What’s header tank / heat pump going to cost me? Couple of grand?
The other thing to consider is that the PV isn’t really free is it? Because if i’m not exporting it, that’s 5.5p per unit per kWh that i’m not getting back in export payments (i’m moving to Octopus Outgoing soon so all exports will be worth money to me, not just deemed 50%).
Batteries are too expensive for the payback too at the moment.
Maybe I just sit tight and wait for EVs to come down in price and put my money and spare PV in to that?
Any thoughts would be appreciated. Thanks.