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Air source heat pumps - advice please

3 replies

housequestion · 28/10/2013 18:11

Posted this in Chat then found out that we have a Property section!

Nc for this - very obscure question to ask and hope the power (no pun!) of MN can help!

Very close to signing on the dotted line to buy a house off plan, however it has a bit of an odd heating system and having done a bit of research am a bit concerned.

It's going to have an air source heat pump for central heating and water (no gas at all) and the manufacturer and model is the Daikin Altherma Low Temperature Split system. It has a unit outside which looks like an aircon unit and a cylinder thing inside.

It's meant to be v efficient and green etc but there seems to be a few issues mentioned.

Concerns are -

  • The garden is very small and apparently the outside units can be noisy. The unit is 5m away from the back of the house so you're right next to it when sat in the garden etc. Also if it blows cold air at you then you'd be close enough to always be in a draft in the garden.
  • Apparently the indoor unit can be noisy too as there's hydraulics inside. Have seen a thread where someone complains that it's noisy enough to stop them sleeping.
  • There's no alternative system which a few heating engineers have said is a good idea to have.
  • Apparently they're very efficient but only up to a point - the system may not be powerful enough to heat a big space when it's very cold outside.
  • Because they're so new, lots of engineers aren't very familiar with them so more of a pain if there is a problem.

Obviously the house isn't built yet so we can't actually be in the house and see what it's like which I suppose is a risk of buying off plan but of anyone is - or knows any - heating engineers or has one of these systems themselves then your advice would be much appreciated!

OP posts:
LittleSiouxieSue · 28/10/2013 19:30

We have two air source heat pumps which are sited next door to each other. We have quite a large house and a large garden. We have sited them behind the car port in a part of the garden where we do not sit but use it as an overflow car parking area. They are slightly noisy (fans) and do blow out quite a lot of cold air so you definitely do not want to sit near one. Ours are Mitsubishis. I really think you may have a problem in a smaller garden because you will not be able to escape from it. Ours are like two large fridges in size and we notice the cold air about 5m away, and definitely when we use the gardener's loo which is right next door to them. Not sure if this would be the same with one unit but I would be concerned. We were using oil for our heating and we have poor access. No gas in the village. We have saved money though as we were spending thousands on oil but obviously our electricity costs are higher, but not as high as the oil would have been. We have not had any problems heating the house and we are about 5000sq ft plus double garage and barn style loft over so ours heat quite a lot very adequately and we have never been short of hot water. We have a combination of underfloor heating and radiators. We supplement with a wood burning stove in our family room and have a fire in the lounge every so often.
Can you visit the supplier and see one in operation? Could you look at siting them somewhere else on the property? It suits us very well but you need to be sure you are happy with the technology. If you have no gas you have other choices such as calor gas, electric, oil or another green system.

SunnyRandall · 29/10/2013 13:04

Our local housing association has just replaced air source heat pump systems in their 2010 built homes with gas at a cost of £250k. This is after three years of complaints from residents about freezing houses and sky high bills. They actually had compensation from the HA.

Not sure of details as it was a friends house but other than not keeping them warm, they frequently broke down, engineers who were familiar with the system were like hens teeth and the controls remained a mystery even after three years.

Obviously not all systems are the same but I wouldn't go near a house with that type of system.

housequestion · 29/10/2013 14:16

Thank you both very much, very helpful especially advice on the cold air and the noise.

Think it would be silly to buy off plan, heating is such an integral aspect of a house after all!

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