Notifications

Clear all

ASHP in Hampshire

batalto · 2021-04-22T13:28:11Z

Hi all, Just wanted to talk you through our upcoming ASHP installation. We live on the south coast, just outside of Portsmouth. The house is a detached home of around 260m2 in footprint. The bottom floor was an extended bungalow and we added a second floor. The first floor is standard construction, brick cavity that's filled and double glazed. The upper floor is made of Structurally Insulated Panels (SIPs) with triple glazing. We had to use SIPs because they are lightweight and so wouldn't affect the shallow bungalow foundations. As an upside SIPS are also extremely efficient in retaining heat and have a very low U value, 0.18. The loft has 200mm of insulation in the middle beneath the floor and 400mm of insulation for everywhere else. We have 8.4kW of solar PV on the roof and 7kWh of battery storage (Pylontech batteries). We also have a Solic solar PV heat controller, which will dump excess solar power into the tank before we export. We've just had our EPC done and we scored very highly A (93) that also provided a heat demand of 34w/m2 which tallies with our ASHP assessment of 36w/m2. The ASHP is a 12kw Midea with a stated SCOP of 3.36 supplied and installed by J A Rees, sourced from Freedom Heat Pumps - total cost just under £10k. We will be replacing our current 32kW gas system boiler and hot water cylinder and using the green homes grant for £5k of the cost and I will paying the other £5k. We qualify for the highest RHI so would expect to get roughly £7200 back over the next 7 years. The boiler will be retained as a backup heating system and isolated from the ASHP system. We have been told this is fine with the RHI as its a backup and not hybrid. The heating is currently set to 45 degrees and we have had no problems. Our main living area has a large bifold door system and west facing. This means we have significant heat loss in the winter and for 2 months its very cold and this makes the room chilly, but not cold. All the other months the solar gain is significant, heating the room and the rest of the house. With the conventional boiler the room is chilly, so I am expecting issues in January heating up the room. We might need to come up with a plan for this room, possibly some thick curtains. The install will be next week and should be very straightforward. The ASHP will go on the drive next to the current power intake. The pipework will go straight through the wall into the current boiler room and tap into the current pipework. The tank will need replacement for one with a larger coil, but more or less everything else will remain the same. The aim is 2 days. Currently our gas is 2.5p and electricity is 14p and the current boiler is 58% efficient (according to the boiler) - this leads to a bill of around £1250 for both gas and electricity for the year. With the ASHP, boiler efficiency and assuming a worse SCOP of 2.7 on the current tariff we expect the bill to fall to just under £1,000 (34,000kw of gas to 7,000kw of electricity). This cost includes a standing charge for gas even though we wont be using it. My plan after we have got used to the ASHP is to upgrade the batteries and add 7kw extra, then move to a new tariff. Agile GO is very interesting as I could fill my batteries at night and expend them during the day. The batteries would store 11.4kw (14kW @ 80% Depth of Discharge). I have estimated this would further drop my bills down to £780

Page 5 / 21 Prev Next

Air Source Heat Pumps (ASHPs)

Last Post by batalto 2 years ago

243 Posts

14 Users

128 Reactions

48.1 K Views

RSS

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 28/07/2021 2:05 pm

@morgan pretty poor. Although with the GHG having ended, I doubt they are in a rush

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

ReplyQuote

Morgan

(@morgan)

Noble Member Member

Joined: 5 years ago

Posts: 625

28/07/2021 3:00 pm

@batalto how long after accepting quote and paying initial deposit should I expect contact re the tech’ survey?

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

ReplyQuote

JulianC

(@julianc)

Noble Member Member

Joined: 5 years ago

Posts: 332

28/07/2021 3:06 pm

@batalto - when you say waiting RHI, what do you mean? I filled my RHI request on-line and pressed go. And the response came back approved in seconds. Set up my bank account payment and boom. All done.
Our first payment due now

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 28/07/2021 3:29 pm

@julianc because of the Green Homes Grant the documents need to be reviewed. I had to submit paid invoices to show how much I paid towards the system and how much the GHG covered. As an FYI my cost was £10,340 and the GHG picked up £5k of that for me. This reduces the RHI by the same amount (£5k)

ReplyQuote

JulianC

(@julianc)

Noble Member Member

Joined: 5 years ago

Posts: 332

28/07/2021 3:34 pm

Arh ok. Understood. I didn’t use GHG

Good luck with all the documents

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger

ReplyQuote

Morgan

(@morgan)

Noble Member Member

Joined: 5 years ago

Posts: 625

28/07/2021 5:32 pm

Posted by: @morgan

@batalto how long after accepting quote and paying initial deposit should I expect contact re the tech’ survey?

Update. Chased them and now have a tech’ survey booked in for 10th August.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

👍

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 28/07/2021 6:23 pm

@julianc they said it would be up to 10 days. From what I've seen it'll be quicker

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 30/07/2021 11:13 am

As a note - RHI approved. £219 a quarter for the next 7 years, inflation linked at CPI - more than covers my costs

ReplyQuote

JulianC

(@julianc)

Noble Member Member

Joined: 5 years ago

Posts: 332

30/07/2021 11:24 am

Good news @batalto Is your ASHP fully funded by GHB and RHI?

I have received my first quarterly RHI payment of £357

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and new Hyundai Ioniq 5 N electric vehicles with Myenergi Zappi mk1 charger

👍

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 30/07/2021 11:37 am

@julianc It will be yes.

£10,000 for the whole system

£5,000 GHG

£6,132 RHI (plus inflation)

£11,132 total from the government for the system

👍

ReplyQuote

Jeff

(@jeff)

Noble Member Member

Joined: 4 years ago

Posts: 487

30/07/2021 11:50 am

Be interesting to see what happens if the government go ahead as planned and replace the RHI in March next year with an upfront grant of up to £4,000.

£11,132 vs £4,000 is quite a big difference.

I assume the current RHI is probably unaffordable for the government as the number of installations ramp up.

👍

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 4 years ago

Posts: 1091

Topic starter 30/07/2021 2:22 pm

@jeff seems to me like the GHG is just being replaced with a grant £4k less and the RHI is being scrapped. My cost profile would totally change and probably make the ASHP not worth it - unless the price of electricity changes to a much lower base. As is I'll make money and my cost should also reduce due to my solar and batteries

ReplyQuote

Page 5 / 21 Prev Next

26 Forums
2,158 Topics
47.4 K Posts
21 Online
5,736 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

RE: Midea ASHP – how to set weather compensation

@benson I believe, noting the data in 16 hourly interva...

By Tasos , 12 minutes ago
RE: Failing heat pump system - seeking thoughts on a rebuild

I couldn't agree more. This is a case where you buy as...

By JamesPa , 8 hours ago
RE: Electricity price predictions

Community energy installations are a great idea, but th...

By Scalextrix , 22 hours ago
Inventor (Midea) Heat Pump short cycling advice

Hello, I have a Inventor (Midea) 8kW with a 800meters Φ...

By immunity , 22 hours ago
RE: Can you help with our research: solar panels, EV chargers, home batteries, heat pumps?

I have signed up as well. @belsnugg could you outline ...

By JamesPa , 1 day ago
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?

Ooh, heat pumps in neon blue wrap 🤣 🤣 &...

By Old_Scientist , 1 day ago
RE: Samsung problems

@profzarkov Good to know in case it ever happens to me...

By bontwoody , 2 days ago
RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

I mean, is this surprising? The local installers in my ...

By Alex , 2 days ago
RE: Samsung Controls

@old_scientist sorry, I should have made it clear that ...

By GrahamF , 2 days ago
RE: Mitsubishi Ecodan 11kw Defrosting Issue.

@thundermink can you provide photos to illustrate your ...

By Morgan , 2 days ago
RE: Boiling Mad: Exposing Radiatorgate

Hi @Rob, I’d be more than happy to contribute. I have ...

By DREI , 2 days ago
RE: Solar Power Output – Let’s Compare Generation Figures

@andris a great year - very happy with our system

By Profzarkov , 2 days ago
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House

After our rather lengthy meander off piste, I thought I...

By GrahamF , 2 days ago
RE: Ecodan software update. Real or scam?

@vinz86 Contact Mitsubishi and an engineer attends and ...

By ASHP-BOBBA , 3 days ago
RE: Seeking Help for In-Principle Quote to fix a botched heat pump installation by Heat Geek Installer

@drei When I was in local government we were of cours...

By JamesPa , 3 days ago
RE: Heat Pump SCOPs – The Truth Might Not Be What You Think

Sufficient system volume is also essential for ensuring...

By Old_Scientist , 3 days ago
RE: Flexi-Orb Heat Pump Scheme: A Game-Changer for the UK's Heat Pump Industry

As someone who has suffered from a Heat Pump installati...

By DREI , 4 days ago
RE: What crazy nonsense are inverter limits and why are they imposed?

I’ve also got a dual fuel Rangemaster. We originally ha...

By Majordennisbloodnok , 4 days ago

Forums

ASHP in Hampshire

Join Us!

Podcast Picks

Latest Posts

Members Online