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Heat recovery systems

 
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Well & Truly Off The Grid
Last Post by robl 5 years ago
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 robl
(@robl)
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Joined: 5 years ago
Posts: 216
25/03/2022 3:29 pm  

We had a vent axia HR25 for a few years, it worked quite well.  It's a fan replacement unit, with heat exchanger - there are quite a lot on the market these days.  It measures humidity and runs faster after a shower typically. 

In our case it was a "gateway" unit, and I sold it on after a few years 2nd hand.  We did a lot of air-tightening, and fitted full house MVHR which does the same thing, just better.  I agree that the money is difficult to justify - I think it saves around 1MWh of heating per year in our 4 bed 120m^2, 300m^3 house, which equates to around £80 of gas these days, while using £20 of elec.  As it was a diy fit, that gives a payback of £2400/(£80-£20) = 40 years.  If it were pro fitted, the bill would be 2*.  But the house is so much nicer now, we don't have to mess around opening windows when it gets stuffy, it's quiet inside, we're saving energy hence CO2.  We got a new kitchen 15 years ago, that will never pay back...

*edit - added in the elec cost to the "payback" calc



   
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 heat-pump-newbie
(@heat-pump-newbie)
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16/04/2022 10:44 am  

@robl What make of MVHR did you get please ? Do you expel kitchen air separately (I've seen this mentioned as an option as it might clog filters in the MVHR unit sooner)?



   
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 robl
(@robl)
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Joined: 5 years ago
Posts: 216
16/04/2022 11:38 am  

@heat-pump-newbie 

We have a Vent Axia Sentinel Kinetic Plus BH.  Which I recommend, had it maybe 8 years, never gone wrong.  It has a kitchen extract, and I put a grease filter on it.  We independently have a hob top extractor fan, which goes outside directly.  I agree with your comment - if you do a lot of frying there will be a lot of grease, and best not to clog up the mvhr with it.  So once every few days the extractor is on for 10 mins.



   
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