WelshMatt
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I've been put of PIV and vents now for sure by all the comments here so it was worth my post just to have some clarity 😀 My current home is just a bog standard semi detached with a gas boiler and manual windows for ventilation so this would be a massive change for me.
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What are the best ones that have no risk of 'sagging' over the years? I guess sips aren't the best but there has to be a compromise along the way in terms of costs and build time. Unfortunately I won't have a massive budget and I'm not that good with my hands to take on a lot of the work myself.
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Fair points. I'm not to concerned about the install as it's would be in a new build so I'd have to get someone qualified for the install to get the whole thing signed off anyhow. I assumed that an ASHP also had some sort of pump indoors as well before the tank, is that not the case then? Here's some information I had from the manufacturer on the differences between the 2 systems: In that way, they share the same refrigeration principles as other heat pumps, the closest heat pump relative being an Air Source Heat Pump, however... Where an Air Source Heat Pump has: * A rotary compressor * An enclosed finned tube heat exchanger (evaporator) * A large fan to convect air over the evaporator * A plate heat exchanger (condenser) * A motorised valve * And a pump to circulate water through the plate heat exchanger. A Solar Assisted Heat Pump has only: * A reciprocating compressor & an externally sited aluminium roll bond heat exchanger (evaporator) This is why I preferred it as less moving parts to go wrong and their cheaper.
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Isn't that the same with a ASHP as well? I think that both systems have an automatic defrost cycle that they run through when they frost up.
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I'm led to believe that it works down to the same temperatures as an ASHP.
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£300 is amazing. I've been lurking on Facebook and people complain that theirs cost a lot more than that but I think they are retrofitted and not new builds. Here's the link: https://sahp.info/ It doesn't have the fan part just a compressor.
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Exactly, I've always wanted a woodburner so a woodburner is what I will have even if its rarely used. I don't see the point of buying an expensive ASHP that will cost a lot to run when I can have a Solar Assisted Heat Pump that has fewer moving parts to go wrong and only consumes 500watts when it's running for around 4 hours a day to get the hot water tank upto temperature. I'm sure if I can survive in my cold house now then whatever I get in the future will be a massive upgrade and cost less to heat.
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That sounds like a good idea. I'm guessing that the stud wall would have a couple of vents in it to the rooms? I doubt planning would allow that in my case on a new build though unfortunately.
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Thanks for the info. That DHW shows a 6.57kWh daily energy use. That can't be right can it!? It would cost a load to run that on the grid. I had thought about a timber frame with hemp insulation but at least with a SIP it's made off site and just assembled at the build site so saves on labour costs plus as they use expanded polystyrene its only technically 3% plastic and doesn't have the risk of sagging and loosing efficiency over time like soft insulation does. Also there is much less thermal bridging compared to a timber frame build.
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Ah I see. I'm guessing that those are just washable then and don't have to be replaced all the time right?
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The house design is non negotiable. Its what I've always wanted layout wise and ease of use as I get older. I'll keep looking for a south facing fairly flat plot and until then I can wait and save more cash for the build.
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Yeah I guess your right. Damn I hate Regulations haha. My only benefit of going the PIV route was to avoid all the nasty ducting that could potentially get clogged up with dust and hair over the years so I thought let's go with the more natural route of just using natural airflow like people have for hundreds of years. I can see that MVHR is more efficient in terms of energy use though as long as the heat recovery is as good as they say it is. I also think that when I open the windows which I will as I can't stand being stuck indoors with no natural airflow and open the doors for the dogs to go out all the benefits of the MVHR will be lost in a matter of minutes.
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The pipe is what worries me most. The flexible pipe is that ridged stuff and I worry that over the years that will get clogged up with dust and hair (our 2 big fluffy dogs produce a lot of loose hair, literally fur balls floating around the place!) and I won't be ae to access it to clean plus the filters getting clogged often.
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Thanks for this. Does doubling the size mean double the price? 😬
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Do you find that you need to use your ASHP for room heating as well as the wood burner or is it used mainly for the hot water? And yes the house will be super insulated with the SIP panels and will face south.