Nibe 8kW F1145, Isle of Skye, Scotland
Hi Mars,
Many thanks for creating such a useful site and I only wish it had been in existence 12 years ago while I was researching my own new build project here on the Isle of Skye in the often chilly west coast of Scotland.
So, I finally had installed in 2012 a Nibe 8kW F1145 connected to 2 vertical boreholes each 80m deep, and the system continues to perform well.The 4-bedroom house has a floor area of 170 sqm with underfloor heating throughout. It has taken me a long time to become familiar with the system and I'm still learning, but the investment of time and energy is essential to continually check that it works as it should and to avoid scary electricity bills.
So, the heat pump is connected to a Nibe 300-litre DHW cylinder with 400-litre buffer tank for the UFH. I find the heating curve (weather compensation) settings work fine and I make sure that all the room thermostats for the UFH are fully open so that the heating curves fully control the system.
System 1 (buffer tank) is set to Curve 4 and System 2 (UFH) to Curve 3 and this maintains a comfortable indoor temperature of 21 degrees C with a corresponding System 1 and System 2 flow temperature today 27 Feb, with outdoor temp of 8 degrees C, of 27 and 25 degrees C respectively. The F1145 has a stated COP of 3.55 and its annual consumption is 9,248 kWh which averages as 25 kWh per day.
I hope that the detail here is helpful to anyone else currently in the research phase. However, I strongly agree with others that the first priority must always be in ensuring the optimum energy efficient design and construction of the house, especially around the windows and insulation. My house has quite a lot of glazing - 5 sliding patio doors and 12 velux roof windows - and the Rationel windows are excellent and draught-free, but you do have to be careful with the glass as it tends to scratch easily even when undertaking normal cleaning.
Thanks for reading this far, and good luck.
Welcome to the forums @donald and thank you for sharing your sharing your positive experience and for reminding is that heat pumps can work when designed and installed correctly. It's also heartening to hear your system is now 10 years old and going strong. The other thing that leapt out at me is the 400 litre buffer store - that's massive, or is that standard for GSHP systems? What is the approximate footprint of your property that you're heating?
Pre-order: The Ultimate Guide to Heat Pumps
Subscribe and follow our Homeowners’ Q&A heat pump podcast
Many thanks, Mars and my mistake - my Nibe 300/450 VPAS DHW cylinder in fact incorporates a 450-litre buffer tank. I hadn't realised that this was overly big, but does indeed appear to be excessive married to my 8kW GSHP.
I should have added that I also have a 5kW roof-mounted solar thermal connected to the bottom coil of this cylinder but my RHI application for the solar thermal was rejected as with this tank set-up, the solar cannot be deemed to be providing renewable heat exclusively for the DHW.
- 26 Forums
- 2,153 Topics
- 47.3 K Posts
- 51 Online
- 5,673 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Midea ASHP – how to set weather compensation
@pash44pump - good, you are on the case. Jaw jaw is alw...
By cathodeRay , 32 minutes ago
-
RE: Heat Pump SCOPs – The Truth Might Not Be What You Think
Sufficient system volume is also essential for ensuring...
By Old_Scientist , 38 minutes ago
-
RE: Boiling Mad: Exposing Radiatorgate
@rob-nezard you can see more of Drei's rad dramas here ...
By Mars , 47 minutes ago
-
I have just completed my first year with my Gen 7 12Kwh...
By Broadsman , 49 minutes ago
-
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
@drei I will say again that Im sorry to heat about your...
By JamesPa , 2 hours ago
-
@drei I was very sorry to read this heartbreaking story...
By GrahamF , 2 hours 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 , 12 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
1040kw Even beat June and July. Great month.
By Andris , 14 hours ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
Hope they know what they're doing regarding paint types...
By PatrickVito , 14 hours 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 , 17 hours ago
-
RE: Octopus tariffs - a quick comparison
@tim441 I’d agree wholeheartedly with that, with 2 x Po...
By Toodles , 18 hours ago
-
RE: Electricity price predictions
@bontwoody Maybe one for @editor to consider whether a ...
By ChandyKris , 24 hours ago
-
RE: is a home battery without an EV worth it?
You would think, but when I had my Powerwall 3 installe...
By Old_Scientist , 1 day ago
-
@mars That response surely deserves a nomination for Tu...
By JamesPa , 2 days ago
-
Specifying batteries, pv solar etc using ChatGPT
I thought I'd try to use ChatGPT to specify my requirem...
By Tim441 , 2 days ago
-
RE: Ecodan & MelCloud scheduling
When I interviewed Mitsubishi Electric at Installer ear...
By Mars , 2 days ago
-
RE: Rodents! A word of warning for heat pump owners
@lucia One look at that protection and the rodents will...
By Toodles , 2 days ago
-
What is the Heat Geek Guarantee?
We regularly hear from homeowners who are researching i...
By Mars , 3 days ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk, interesting point. I’ve not focused much on Hea...
By Mars , 2 days ago