Heat recovery systems
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
@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)?
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.
- 26 Forums
- 2,208 Topics
- 48.7 K Posts
- 63 Online
- 5,868 Members
Join Us!
Podcast Picks
Latest Posts
-
If I managed that, I’d be tickled pink.
By Majordennisbloodnok , 1 minute ago
-
Apologies. I meant that tepeo is working with flexibili...
By wully , 2 minutes ago
-
RE: Samsung Heat pump with Yonos Pico circulating pump running all the time
Doesn't the Joule preplumbed cylinder include a buffer?
By JamesPa , 26 minutes ago
-
RE: Daikin 9kW to 8kW Swap Offer from Octopus
Not so. In my case it made the difference between 10.5...
By JamesPa , 3 hours ago
-
@bontwoody, I have to say, the response time here is re...
By Mars , 5 hours ago
-
RE: Renewables & Heat Pumps in the News
It rather depends on what we call 'local area' and 'tot...
By Transparent , 7 hours ago
-
RE: Mitsubishi Ecodan F8 error
Better than an early Windows/DOS error 'Faulty keyboard...
By JamesPa , 8 hours ago
-
I can now, I done an automation in Home Assist...
By DREI , 8 hours ago
-
RE: Bosch CS5800i 5kW - Experience So Far
What a difference a pump makes. We don't have OpenEne...
By Steelbadger , 8 hours ago
-
RE: Inventor (Midea) Heat Pump short cycling advice
I installed the 80L tank (volumizer) things got better ...
By immunity , 13 hours ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
@papahuhu at the end of the day if you are happy with h...
By benson , 1 day ago
-
RE: Can you recommend a Mitsubishi service engineer in the Rochdale area?
@dgclimatecontrol We'll all need annual servicing. How...
By Suzy-shadow , 1 day ago
-
RE: Octopus tariffs - a quick comparison
Does indeed need checking, @tim441. Neither Homely ...
By Majordennisbloodnok , 1 day ago
-
RE: How not to install a heat pump
Delighted to hear that the buffer has been replumbed as...
By JamesPa , 1 day ago
-
-
RE: The Hidden Secret to a Successful Heat Pump: Pipe Size Matters
@davidnolan22 So far as I can tell from the 'other p...
By JamesPa , 1 day ago
-
RE: 5 Star Service from Havenwise
I keep getting havenwise ads on my Facebook feed, so cl...
By benson , 1 day ago
-
Automation options to maximuse efficiency & ToU tariffs
I started a conversation with ChatGPT. What automation...
By Tim441 , 2 days ago