Pablo Blowfish

Can someone tell me if these details are ok? I'm concerned if the DPC is in the correct place - many thanks all feed back welcome!

Thanks - I'll check the flow rates - BTW of the two examples the first one was the one that was amended the seconded was the one I wasn't happy with - cheers

We recently had an Aira chap round, (long warranty). Told us a 6kW ASHP would be ok. We're not eligible for a grant because the previous tenant had one installed (even though the grant was £750 over 10 years ago). (We removed the 2012 ASHP—it was a noisy machine, and we’re after something quieter and more efficient - (is this the right thinking?) it's still in the garage). My partner is all for buying new (with a long warranty) I'm up for taking a chance as there's some good value machines out there. - What system would you have if you were to do it again ? Current thinking is 2 zone 60ish m2 under floor heating 16mm pipes 100mm centers + radiators up stairs - aiming to have a low flow temp and take advantage of the thermal mass of the thick walls and floor Looking forward to hearing your thoughts, especially considering the low flow temperature target and potential ASHP options (new vs used) - what should we have on our shopping list - ? Background We bought an old (1850 stone built ) drafty damp house with an ASHP that needed a complete overhaul / insulating / damp problems solving... it's been quite a journey but we now have windows.. so thats nice.. Current Setup Plan: Heating Zones: Ground Floor: ~60 m² underfloor heating with 16mm pipes at 100mm centres. First Floor: Radiators. Aiming for a low flow temperature to maximise efficiency and leverage the thermal mass of thick stone walls and the floor. Heat Loss Calculations: I did some rough heat loss calcs based on U-values from ChangePlan's U-Value Calculator. Heat Loss Breakdown: Area m² U-Value Temp Diff (°C) Heat Loss (W) Extension Walls 44 0.179 25 196.9 Stone Walls 48 1.26 25 1512 Windows & Doors 20.38 0.82 25 417.79 Old Roof 71 0.14 25 248.5 New Roof 34 0.147 25 124.95 Old Floor 56 0.22 25 308 Extension Floor 29.8 0.163 25 121.44 Total Fabric Heat Loss 2929.58 W Ventilation Heat Loss: Volume (m³) ACR Constant Temp Diff (°C) Heat Loss (W) 365.5 1 0.33 25 3025.46 Total Heat Loss (including 20% buffer): Fabric: 2929.58 W Ventilation: 3025.46 W Total: 7364.44 W (7.36 kW)

Forgot to follow the topic!

I had some pipe layouts done and wasn't pleased with the density / layout so I read a bunch of stuff on the internet and had a go. - have I got this right? Refurbing an 1850 stone build terrace - - 16mm at 100mm centers - 8 runs of 70 ish m - Total floor area 65m2 give or take Looking to use an 8KW ASHP - for a room temp of 17-20 c flow temp 20-25 c? The floor build up old house geotextile /260mm Glass foam insulation / geo textile / Geo Grid with piping cable tied / 70mm limecrete base (1:1.5 lime NHL 5 / Nosterfield) / 70mm Lime adhesive / upto 70mm thick slate slabs 80's extension 100mm PIR / Geo Grid with piping cable tied / 70mm limecrete base (1:1.5 lime NHL 5 / Nosterfield) / tiles and similar but toped with engineered oak in the lounge Needless to say we're adding lots of Insulation it the roof. Rough heat loss calcs come out around 3kw +Ventilation loss + performance gap etc. Looking forward to your feedback