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Air Source heat Pump
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<blockquote data-quote="Dave645" data-source="post: 6644244" data-attributes="member: 55822"><p>Hi</p><p>I take your point on insulation, but don’t forget these systems are expensive far more so than there oil counterparts.</p><p>So size of the system is linked to heat demand and that’s linked to insulation. Large size large price.</p><p></p><p>It’s always better value to insulate first. As that can reduce the cost of the system you need.</p><p></p><p>Extending on that by type.</p><p>GSHP are different to air, they have a limited resource, the ground coil, to bring energy into the house with, so this is why is insulation very important to GSHP systems, it’s down to the size of the system needed judged on the heating demand, <strong>and the size of the loop</strong>, so the instal cost of the system is vastly more expensive.</p><p>So insulation is always the best option first get the house as good as you can then size the system.</p><p></p><p>Air source, are a little different while less efficient and costing more to run especially in low temps ie high demand times where they can fall to levels where efficiency drops back to nearer 1:1 for 1:2 over the GSHP version in very low temps. They don’t suffer from limited input energy, limits of the GSHP have ie the ground loop.</p><p></p><p></p><p>Also note high demand heating requires higher running temps in your radiant system, (also less efficient) to offset heat losses, and bigger air source heat pumps maybe you will need multiple, so making the system more expensive to install, that also effects the electric supply demand of your system, if you have 30kw of heat pumps running to heat a big cold space, can your electric supply actually take that. 24/7 on top of your other loads?</p><p></p><p></p><p>Another point is, Sweden has some of the best insulated homes out there like triple glazing etc, as nearly standard, so they can install small heat pumps so they are cheap.</p><p></p><p>While I cannot say if your home is suitable for a heat pump of any type, limping your current system on or just directly replacing it with a new one if it’s on it’s last legs and insulating the rooms you heat with the vast amount of money you will save over fitting a very large heat pump system. May be the better use of your money.</p><p>Insulation is always a better return on your money that better heating, until your at passive levels, which are easy to find.</p><p>It’s your money and your choice, but cost up a system and ask some professionals to take a look.</p><p>Heap pump systems are not cheap. heat pump systems will be big money, and still cost you an arm and a leg to run.</p><p></p><p>In your position I would be looking to heat with wood in the limited rooms in question with modern wood burning stoves, while a chore they can be cheap to run if you can source the wood at off peak times ie anyone chopping down trees and cutting it and drying it yourself. Just chose room sealed stove with direct air supplies to avoid large drafts.</p><p>Open fires are very poor and to be avoid at all cost if possible.</p><p></p><p>I don’t envy your trouble in making these choices. Good luck.</p><p></p><p>While in Sweden they may have one air-source heat pump, for the whole house you may need one for each room. That’s all down to insulation levels.</p></blockquote><p></p>
[QUOTE="Dave645, post: 6644244, member: 55822"] Hi I take your point on insulation, but don’t forget these systems are expensive far more so than there oil counterparts. So size of the system is linked to heat demand and that’s linked to insulation. Large size large price. It’s always better value to insulate first. As that can reduce the cost of the system you need. Extending on that by type. GSHP are different to air, they have a limited resource, the ground coil, to bring energy into the house with, so this is why is insulation very important to GSHP systems, it’s down to the size of the system needed judged on the heating demand, [B]and the size of the loop[/B], so the instal cost of the system is vastly more expensive. So insulation is always the best option first get the house as good as you can then size the system. Air source, are a little different while less efficient and costing more to run especially in low temps ie high demand times where they can fall to levels where efficiency drops back to nearer 1:1 for 1:2 over the GSHP version in very low temps. They don’t suffer from limited input energy, limits of the GSHP have ie the ground loop. Also note high demand heating requires higher running temps in your radiant system, (also less efficient) to offset heat losses, and bigger air source heat pumps maybe you will need multiple, so making the system more expensive to install, that also effects the electric supply demand of your system, if you have 30kw of heat pumps running to heat a big cold space, can your electric supply actually take that. 24/7 on top of your other loads? Another point is, Sweden has some of the best insulated homes out there like triple glazing etc, as nearly standard, so they can install small heat pumps so they are cheap. While I cannot say if your home is suitable for a heat pump of any type, limping your current system on or just directly replacing it with a new one if it’s on it’s last legs and insulating the rooms you heat with the vast amount of money you will save over fitting a very large heat pump system. May be the better use of your money. Insulation is always a better return on your money that better heating, until your at passive levels, which are easy to find. It’s your money and your choice, but cost up a system and ask some professionals to take a look. Heap pump systems are not cheap. heat pump systems will be big money, and still cost you an arm and a leg to run. In your position I would be looking to heat with wood in the limited rooms in question with modern wood burning stoves, while a chore they can be cheap to run if you can source the wood at off peak times ie anyone chopping down trees and cutting it and drying it yourself. Just chose room sealed stove with direct air supplies to avoid large drafts. Open fires are very poor and to be avoid at all cost if possible. I don’t envy your trouble in making these choices. Good luck. While in Sweden they may have one air-source heat pump, for the whole house you may need one for each room. That’s all down to insulation levels. [/QUOTE]
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