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Single Room Heat Recovery Units - Advice please

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  • 29-06-2009 10:24am
    #1
    Doctor_L
    Registered Users Posts: 94 ✭✭


    Hi,

    I am looking to install 2 SHRVs in to our house so as to improve the thermal comfort of a north facing bedroom and a west facing bedroom. The house is on a very exposed site and heat loss during the winter months due to the 4 inch hole in the wall is excessive.

    Glas sell an inventer unit for 700 Euros installed which seems very pricey.

    Alternatives include KAIR http://www.i-sells.co.uk/kair-eco-single-room-hrv-est-approved-for-eec which are priced at 326 sterling and I would have to get an electrician to connect it.

    If any one has any experience with these unit or can recommend a simple solution that allows air flow with out excessive heat loss it would be appreciated.

    Thanks

    Liam
    Tagged:


Comments

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    #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    As far as i know these are new to Ireland - so not a lot of end user experience to draw on .


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    #3
    al2009
    Registered Users Posts: 176 ✭✭al2009


    400e plus shipping, are you hoping the sparks will drill the hole for you?
    700 installed looks pretty good to be honest, have you tried getting a discount? don't forget you will essentially have no warrenty on the english unit.

    al


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    #4
    Doctor_L
    Registered Users Posts: 94 ✭✭Doctor_L


    Hi al,

    I would prefer a simple mechanical solution if possible.

    Ideally something to plug into the 4 inch pipe.


    Liam


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    #5
    GoneShootin
    Closed Accounts Posts: 8,478 ✭✭✭GoneShootin


    Hmm - intersting idea those things, but not feasibly for whole house solution. Of course you're looking at just 2 rooms. You could just stuff the holes in walls during the colder snaps and crack a window for ventilation!

    edit:
    goneshootin.....
    sticky a smily in when you are being so obviously sarcastic please....

    some readers might actually think your serious....

    regards

    syd


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    #6
    PeteHeat
    Registered Users Posts: 648 ✭✭✭PeteHeat


    Hi,

    I am running two units on a test basis before offering them to customers.

    The basis of the test will not be to see if money can be saved by using the units as such tests need laboratory facilities for accuracy.

    The purpose is to see if the units can keep rooms fresh and eliminate condensation by controlling the air changes.

    They should also help eliminate the cold draught effect experienced by standard open vents.

    So far they are performing well however I will need to run them this winter to ensure there is no temptation to switch them off or block them up during cold windy weather as a blocked vent is counter productive.

    .


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    #7
    RGMR2
    Registered Users Posts: 33 ✭RGMR2


    Hi Doctor L

    Coming to this a bit late but funny you should mention it.... there is a mechanical solution that you stick into a 4" pipe. Seems to work pretty well too. You could possibly try one room at a time and see how you go. Depending on which model you use, they can close off completely in storms. Thermostatically controlled versions too, closing off more when it's colder outside. All singing all dancing version shouldn't be as much as €100. No wiring and a complete diy job. Worth a shot?

    If you wish to PM me, I'll send on the details.

    ATB


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    #8
    Eurorunner
    Closed Accounts Posts: 2,393 ✭✭✭Eurorunner


    This is interesting. I only have two wall vents in the house. One which vents from the kitchen extractor and another that vents from the downstairs bathroom. Is there a version of this product that will work in these instances?


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    #9
    RGMR2
    Registered Users Posts: 33 ✭RGMR2


    Eurorunner wrote: »
    This is interesting. I only have two wall vents in the house. One which vents from the kitchen extractor and another that vents from the downstairs bathroom. Is there a version of this product that will work in these instances?
    Hi Eurorunner. the simple answer to that is 'no'. Best you can manage in the kitchen vent is a back-draft damper. The damper will add a little more resistance to the airflow so if the extract dust run is long it may compromise the system. Not sure if you're talking about a natural vent in the bathroom .......if it's a bathroom fan..some of the better ones have a damper built into them. If not, you may be able to fit a back-draft damper in the duct (pipe) You may have to go to a specialist air ducting supplier to get such a thing. If it's a natural vent then the fresh vent product that I was referring too may suit. Check out the site below.



    http://www.electrika.com/products/m/man-2015/pdftech/dom-06-068.pdf

    Hope that helps.


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    #10
    Eurorunner
    Closed Accounts Posts: 2,393 ✭✭✭Eurorunner


    RGMR2 wrote: »
    If it's a natural vent then the fresh vent product that I was referring too may suit.
    Vent in the bathroom is also with a fan.
    Thanks for the comments though.


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    #11
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    Doctor_L wrote: »
    Hi,

    I am looking to install 2 SHRVs in to our house so as to improve the thermal comfort of a north facing bedroom and a west facing bedroom. The house is on a very exposed site and heat loss during the winter months due to the 4 inch hole in the wall is excessive.

    Glas sell an inventer unit for 700 Euros installed which seems very pricey.

    Alternatives include KAIR http://www.i-sells.co.uk/kair-eco-single-room-hrv-est-approved-for-eec which are priced at 326 sterling and I would have to get an electrician to connect it.

    If any one has any experience with these unit or can recommend a simple solution that allows air flow with out excessive heat loss it would be appreciated.

    Thanks

    Liam

    I wonder what degree of actual room air changes will be achieved by such a unit.

    I have my doubts as to the effective room circulation from a unit which sucks and blows in the same air space.

    Filter changing looks as if the whole unit needs to be taken out, is the wiring long enough to allow the unit be taken to table level for a good clean?

    Why the security screws?


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    #12
    PeteHeat
    Registered Users Posts: 648 ✭✭✭PeteHeat


    Hi Carlow,

    On trickle vent mode the air change is 19m3/h

    On boost its 38m3/h

    Which is not bad for a small unit, on trickle mode it is practically silent running.

    The unit I have on test is basically the same product using the manufacturers brand name.

    The filters are on the side of the outer cover, changed in minutes without tools.

    I expect the final retail for us will be similar to the UK figure but with a €uro symbol instead of the £ symbol.

    Of course that will only apply if we decide they are performing as the manufacturer says they will and we will have for a spot of cold weather to get a real life experience.

    We did not have to use tamper proof screw drivers or anything like them for fitting.

    .


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    #13
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Another heat recovery vent, £174, never used one myself, http://www.bes.co.uk/products/178.asp

    " The VENT-AXIA HR25 (previously Baxi) units provide balanced ventilation with heat recovery and are suitable for installation in bathrooms, toilets, kitchens and utility areas. The tubular unit is designed for continuous operation providing up to 80% heat recovery. Effectively controlling internal relative humidity the unit controls condensation and eliminates mould. The unit’s twin impeller and heat exchanger arrangements simultaneously supplies and extracts air while transferring heat from the stale exhaust airflow to the fresh intake airflow. Installation from inside of building in 6" (150 mm) core drilled hole. 230 V, transformed to 24 V DC. Air extraction 20 m³/hour (low), and 55 m&suo3/hour (high). "


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    #14
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    Thanks PH:
    My reservations/question re the air circulation was not so much the ac/h capacity of the unit as the fact that the inlet and outlet are effectively in the same space in the room and that there is no air circulation as such in the room.

    In a conventional HRV set up the inlet and outlet will be located so as to stimulate actual air movement throughout the building/room etc which will lead to fresh air being more widely spread throughout the building..
    Could be all wrong here:)


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    #15
    10-10-20
    Registered Users Posts: 7,125 ✭✭✭10-10-20


    I get the impression that these devices are simple peltier elements attached to two large heatsinks with cross ventilation through the heatsinks.
    Interesting, but I don't see 17.3W on the "KAIR ECO SINGLE ROOM HRV" doing enough heat recovery to justify the price...


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    #16
    Doctor_L
    Registered Users Posts: 94 ✭✭Doctor_L


    I agree, the Kair units are expensive.

    I have decided to try out the vent-axia thermo 100 units which are mechanical and reduce the air flow if the temperature drops.

    No wiring required, will also insert a storm guard as well for strong winds.

    Liam


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    #17
    Eurorunner
    Closed Accounts Posts: 2,393 ✭✭✭Eurorunner


    Doctor_L wrote: »
    I have decided to try out the vent-axia thermo 100 units which are mechanical and reduce the air flow if the temperature drops.
    Liam - What sort of price are these units coming in at?


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    #18
    Doctor_L
    Registered Users Posts: 94 ✭✭Doctor_L


    Hi,

    lindab are selling the storm guard and thermo 100 for 110 euros approx.

    Liam


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    #19
    Ecallan
    Registered Users Posts: 11 ✭Ecallan


    Doctor_L wrote: »
    I agree, the Kair units are expensive.

    I have decided to try out the vent-axia thermo 100 units which are mechanical and reduce the air flow if the temperature drops.

    No wiring required, will also insert a storm guard as well for strong winds.

    Liam

    Hi Liam

    I am also interested in trying to recover heat from wall vents in my bungalow house. I would be very interested to know how you got on with your powered vent unit.

    I am wondering if there is a solar powered SRHRV product, or perhaps a market for such a product, where the unit has a reasonable size PV panel and backup battery, operating a low noise external fan. I cannot stand to hear the whirr/whine of motors! I know, I'm a pernickety SOB.

    Thanks in advance

    Eugene


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