sligo1986 wrote: » I am currently building a house and have roof on windows in and thinking of what heating system to go with. I am thinking Air/Water heat pump, Ventilation system in house and pv solar panel to help run the heat pump and ventilation system. I also have stove in the main kitchen dining area which I will probably use regularly enough and another one in sitting room which won’t be on much. I was also thinking underfloor heating down stairs and rads upstairs. I was also thinking of putting the Air/water system in the garage which is about 5-8meters from house so as to give me more space in the house. I am totally new to all this and am only learning so would love to hear peoples advice and opinions?
sligo1986 wrote: » Water John, know the a2w unit will be outside but I ment the tank and pipe work in the shed as ive seen it can take up a lot of space in a house. MHRV?? So do you think I should go with thermodynamics solar panels so as to have hot water as well? sydthebeat Originally when planning house I just going with solar panels and stove with back boiler with oil to back up.
sligo1986 wrote: » Cruiser202006, sorry still learning about the plumbing side of things. Secondary return? What is that and how does it work? Also what does an aqua box do?
sheff the ref wrote: » I am at the stage now on a slow moving project where I need to make up my mind and having worked previously in the area of Geothermal I am baffled. Obviously Green energy regulations have to be taken into account though my house was started pre February 2014. I will have a heavily insulated house, 9 inch cavity pumped, plus hopefully triple glazed windows. A well insulated house requires less heat input, therefore I wish to avoid spending pounds to save pennies or burden myself with long term maintenance costs. The outlay is far less for an oil boiler and radiators than for an Air Source or Ground Source heatpump. Long term maintenance is still up in the air regarding geothermal. A car engine requires moving parts to be replaced over time, and heatpumps will be no different and we expect heatpumps to last far longer than the 10 years that cars are scrapped at. In fact the payback in years for Geothermal would be far less in a well insulated house as you do not have the same requirement for heat. Geothermal holds a massive advantage over Oil etc. in places where there is a higher demand for heat such as in houses that were built with far less insulation 10-15 years ago. One massive consideration relating to underfloor is the inability to regulate the house temperatures with underfloor heating in Autumn and Spring when we can go suddenly from cold temperatures for a period to warm temperatures for a period and back to to extremely cold temperatures. I am concerned about the time needed to reheat the house when the temperature has dropped, in short the need for a burst of heat on occasional evenings. If I go oil and rads, then I have to compensate with solar or otherwise. Can anyone advise me.
gooner99 wrote: » Hi Shef. What is you own feeling having worked in the area of Geothermal. Is your experience swaying you away from heatpumps? I get the feeling from your post that you would be happier to heat your house with oil and rads, but you don't like the idea of having to add solar as the part L provision, so Geo/A2W and underfloor are coming back into your thoughts. I am no expert, but I think you are right that ROI is not fantastic on Geo/A2W in a well insulated and airtight house where the heat demand is very small, unless of course oil takes a big hike in price. And that's assuming you won't have any maintenance or replacement costs. But unfortunately the way the regs are, where they encourage you to reduce your energy demands down to a level where you could heat it with a little fossil fuel (or any other method), but they hit you with the renewable stick. I don't see anything wrong with heating a low energy house with oil and rads (except its not the "eco" thing to do), but like you I don't see the ROI with solar panels. What about adding in PV panels. Not sure how much extra they would be, I'd imagine they cost less than solar panels at this stage.
sheff the ref wrote: » I worked in Geothermal way back in 2005. Insulation specs were well off what they are now, floor insulation, roof insulation, windows, doors, wall insulation. I don't think windows were even taped back then. Therefore the heat requirement was much higher back then and therefore the payback on Geothermal was shorter as you were likely to be spending far more on oil. Nowadays specs are far higher, less heat requirement and less heat loss. The expression "A candle would heat a modern house" is a serious exaggeration, but the days are gone of everyone hugged around a fire as the heat wouldn't reach the furthest extents of the room. I don't see the return on a significant investment in what will be a well insulated house.
gooner99 wrote: » Yeah those are my thoughts too. Once the heat demand is down that low, the ROI on a heatpump is much longer. I guess the advantage is no oil to order and increase in oil prices to worry about. Also they cover part L. In my case I am very weary of a a2w given that I'm only yards from the sea and I can see daily what salt air does.
368100 wrote: » Got a price for an A2W heat pump, danfoss with largest size cylinder and full underfloor heating system for a 2150sq ft bungalow. €12k Inc vat fully fitted ....any thoughts on whether it's a good price or not?
Water John wrote: » Are those twin units, that heat the hot water, as well?
Jofspring wrote: » The quotes I got heated the water also. Just for anyone interested. A2W, UFH and MHRV for house 2,444sqft. Quoted price 22k including Vat for the whole system to be installed and set up. Price may vary for other people depending on demand in specific house but gives a rough idea anyway.
Ray Donovan wrote: » Jofspring wrote: » The quotes I got heated the water also. Just for anyone interested. A2W, UFH and MHRV for house 2,444sqft. Quoted price 22k including Vat for the whole system to be installed and set up. Price may vary for other people depending on demand in specific house but gives a rough idea anyway. I'd shop around if I was you. Got the same as yourself for €18,500. 2650 sq ft. IVT heat pump.
