Air Source Heat Pumps

albyota

Geotherm wrote: »

All the WB heat pumps are IVT units, just rebadged, so they also use their compact collectors. Recharge is by a VBX heat recovery unit. We have a few of these installations here with no reported problems.
No need to penetrate the water table, but like conventional loops, damp soil is always better.

http://www.ivt.ee/pdf/Brochure_VBX_Eng.pdf

Mmm, something we don't have a lot of here in the UK...:eek:

Arraswold

That's for the ermm mixed replies. I am on chalk which makes vertical boreholes and indeed 3 m deep trenches difficult. The air source seams like the best option, being a holiday cottage, winter isn't always the busiest so lower temps might be fine if there's no one in it. It's just making sure the price is right and I get the correct installer and machine, however it does seem like you shouldn't take the cheapest option. Thanks for all the advice guys, very much appreciated. Any machine recommendations would be appreciated!!!
Jim

Arraswold

Also plumber said a couple of solar thermal panels would help top up the water from the ashp in the summer?? Do they work well? You can get he RHI though.
Anyone had any experience of these and how much are they?

Thanks again

albyota

Arraswold, Mitsubishi Ecodan are UK market leaders with Daikin Altherma probably second IMO, but there is also Panasonic which I think Mitsubishi ought to watch out for, steer clear of any re-badged far eastern kit, choose youe installer from the MCS website, ask for refereal sites, good luck, if you need more info give us a shout.

albyota

Arraswold wrote: »

Also plumber said a couple of solar thermal panels would help top up the water from the ashp in the summer?? Do they work well? You can get he RHI though.
Anyone had any experience of these and how much are they?

Thanks again

I had 4M 2 of solar thermal panels on my roof.....took them off when fitted PV, IMO, unless you are a care home or a school it is not worth the cost and hassle, 47 year payback.

zeupater

Geotherm wrote: »

All the WB heat pumps are IVT units, just rebadged, so they also use their compact collectors. Recharge is by a VBX heat recovery unit. We have a few of these installations here with no reported problems.
No need to penetrate the water table, but like conventional loops, damp soil is always better.

http://www.ivt.ee/pdf/Brochure_VBX_Eng.pdf

Hi

So, in effect you're describing recharging the ground temperature over the summer by dumping excess heat from the house and provide cooling by effectively operating the HP in reverse by coupling a heat recovery ventilation system ? .....

Thanks
Z

lovesgshp

zeupater wrote: »

Hi

So, in effect you're describing recharging the ground temperature over the summer by dumping excess heat from the house and provide cooling by effectively operating the HP in reverse by coupling a heat recovery ventilation system ? .....

Thanks
Z

Hi

Basically, it extracts warm air from the house to recharge the loop or borehole, so in winter can stabilise input temperature better to help reduce running times. Manual below.

http://www.google.co.uk/url?sa=t&rct=j&q=IVT+VBX&source=web&cd=3&sqi=2&ved=0CDkQFjAC&url=http%3A%2F%2Fdoc.ivt.se%2Fdownload.asp%3Fpt%3Dpdf%26fn%3DManual_VBX400_Handledning%25201.1_en.pdf&ei=YGhDT42RFoWAOuyQjIoP&usg=AFQjCNHofrHV13etVhX44I3rBQG5POeT6g&cad=rja


For cooling in passive mode with UHF or Fan Coils, then you would not use the VBX, but allow the loop temp only.

HTH

Peterg

I am thinking of replacing my 80,000 BTU oil boiler with an air source heat pump heat and have quotes for Ecodan 8.5 Kw, Nibe F2015 9Kw and Ekowarrior 9Kw. Does anyone have any info. on the performance of these units?
The property is a 2Bed. detached cottage of a combined floor area of 84m2, built in 1981, with cavity filled walls, D/G and 300mm insulation in the loft.
Five quotes have estimated the heat requirement for the property as;18,000 Kw, 13,564 Kw, 19,057 Kw, 15,239 Kw and 11,914 Kw. respectively, all based on the same basic info. Only the last quote is based on an actual survey. Why the vast difference ?

Cardew

Peterg wrote: »

I am thinking of replacing my 80,000 BTU oil boiler with an air source heat pump heat and have quotes for Ecodan 8.5 Kw, Nibe F2015 9Kw and Ekowarrior 9Kw. Does anyone have any info. on the performance of these units?
The property is a 2Bed. detached cottage of a combined floor area of 84m2, built in 1981, with cavity filled walls, D/G and 300mm insulation in the loft.
Five quotes have estimated the heat requirement for the property as;18,000 Kw, 13,564 Kw, 19,057 Kw, 15,239 Kw and 11,914 Kw. respectively, all based on the same basic info. Only the last quote is based on an actual survey. Why the vast difference ?

Because there are plenty of people fitting ASHP systems who essentially have no idea what they are doing.

There is no doubt that a properly installed and sized ASHP can work well - as some owners on MSE will affirm.

However IMO the most important thing you can do is check out the installers by contacting previous customers.

Also talk to the Energy Saving Trust for advice.

lovesgshp

Peterg wrote: »

I am thinking of replacing my 80,000 BTU oil boiler with an air source heat pump heat and have quotes for Ecodan 8.5 Kw, Nibe F2015 9Kw and Ekowarrior 9Kw. Does anyone have any info. on the performance of these units?
The property is a 2Bed. detached cottage of a combined floor area of 84m2, built in 1981, with cavity filled walls, D/G and 300mm insulation in the loft.
Five quotes have estimated the heat requirement for the property as;18,000 Kw, 13,564 Kw, 19,057 Kw, 15,239 Kw and 11,914 Kw. respectively, all based on the same basic info. Only the last quote is based on an actual survey. Why the vast difference ?

A circa 9Kw unit should be ok for that size property. As the last quote was from a actual survey, the others could be "guesstimates".
Check the credentials of the companies giving the quotes .... how long have they been installing these units? Customer recommendations etc., as Cardew says.