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Hi All, I hope someone sensible can help point me in the right direction or offer some useful comments on our project...! We'd initially planned to heat the whole place using an oil fired boiler with a wet system - underfloor tray system for the office space with warm air blower to keep frost off the warehouse space in the winter. But now we're wondering whether we can heat the office area appropriately with an ASHP throughout the year, possibly supported with PV panels on the roof? (It's a large roof, approx 250sqm is south facing, unobstructed - we can trim the trees). Outline as follows: We have a steel portal frame barn which we're converting into a warehouse with internal offices. The existing asbestos roof and steel sides will be replaced with insulated Kingspan panels (KS1000RW 100mm for roof and 73mm for the sides - both with U Value of 0.18 W/m2). The building measures 25m x 17.5m, average height is 5.25m. (see plans) Within the building is the office, which measures 8.3m x 15m x 2.6m. Ignore the additional small building on west side it's being demolished. When it's -3 deg C outside we'll need to maintain approx 10 deg C in the warehouse and 22 deg C in the offices. The place is only occupied during normal office hours. i.e. I'm not worried about keeping it warm at night, just that it doesn't freeze! We guess our heat demand would be approx 4kW for the office area and 16kW for the warehouse. (Maybe someone can tell me if this is miles off?). How can I work out how much energy an appropriately sized ASHP will USE across the year? Furthermore, we've got a great big roof area relative to the size of the office to be heated so can Solar be used to power the ASHP for most of the year? I guess in depths of winter when it's grey and wet the contribution would be minimal... at the time when the ASHP will be doing the most work and COP would be at its worst? What would a sensible output of PV be? Any advice warmly welcomed! Many thanks, Sven Proposed.pdf Floorplan.pdf birds eye.pdf

I have a boiler that needs repair or replacement in a rented house, and I'd welcome thoughts. The situation is: - I bought property to rent to this tenant in 2016. It is unusual in having 3 double bedrooms, which was why they wanted it. - Good tenant, and I expect the family to stay for another decade (kids are 5-7 old years in local schools, family are all here incl. parents and siblings). They love the house. - It is a 2016 renovated 1910 done by someone else I bought it from - solid walls etc. Not to my standards, but adequate. I keep having to have bits done, which is fine but a small pain. - T is in receipt of housing elements of UC, and child benefit (whatever it is called now) -> may be eligible for Eco4 scheme, which is boiler replacement, or a Heat Pump grant for an ASHP. - Boiler (8 years old) is repairable, but not the best brand. Engineer recommends replacement (they would, but I'm inclined to agree) with a Baxi. I am mainly Ideal or Worcester Bosch. Repair cost £500-1000 suggested. Replacement cost £2-3k depending on model. - EPC is 60D on the sheet, but imo is better than that (I've done a few things, and there are some 'average' assumptions in there.) Had I renovated it that would be at around 75C. - Implication of that is that fitting at Heat Pump could get me over the EPC Grade C requirement which will be coming back at some stage, after Rishi Sunk's "how can I save my arse" 2 year panic attack burning all their achievements - including the landlord EPC ratchet - down. - T says house is comfortable running at a lowish boiler temp (need to check that). - My long term intention is that I prefer no gas (safety and hassle reasons). Options AI see it I have 3 options. 1 - Replace boiler, ideally under boiler upgrade scheme. 2 - Go ASHP with a grant, perhaps via Octopus. Octopus use I think Daikon units. 3 - Go with A2AHPs with a couple of multisplits, and units in relevant rooms. 2 and 3 would require a hot water tank to have space found. Should be doable. I'd welcome all comments, especially around if the Octopus ASHP packages are good, whether ASHPs are easy to manage for tenants, and what lifetime I can expect from ASHP or A2AHPs. Thanks Ferdinand