Hello everyone,
here is the starting situation:
1.5 floors
125 sqm (1350 sq ft)
36.5 cm (14 inches) Ytong blocks
gable roof with 45° pitch including dormer
a decentralized heat recovery ventilation system is also planned.
and if I understood correctly, a primary energy demand of 77.3 kWh/m² (7.18 kWh/sq ft) or another figure of 22.2 kWh/m² (2.06 kWh/sq ft) according to the energy saving ordinance. I assume the second figure applies?
We will probably install radiators (underfloor heating is likely ruled out for now, reasons are not that important at this stage) and our general contractor recently said it might be possible to operate the air-to-water heat pump with radiators. I don’t have much experience here. I know that with an air-to-water heat pump, the flow temperature should be as low as possible.
So the options are:
An air-to-water heat pump (Rotex HPSU Compact 308) + radiators + a "small" photovoltaic system (I'll arrange this myself)
or a gas boiler + solar panels about 5 m² (54 sq ft) (Vaillant auroCompact, size between 3.3 and 14.7 kW still to be determined, including a 150-liter (40 US gallon) stratified storage tank) + a somewhat smaller photovoltaic system (due to space needed for solar hot water).
What is not entirely clear to me is whether the solar panels also cover heating or only domestic hot water.
Which solution would make the most sense in this situation? Advantages / disadvantages?
Currently, I tend toward gas, even though we still have to budget for the gas connection costs here.
I briefly spoke with the photovoltaic provider as well... he said that under the new 2016 regulation photovoltaic systems are taken into account... unfortunately, he only has his training next week and can give me more details then... in his opinion, that might make the solar thermal system unnecessary and we could install more photovoltaics instead.
Best regards to all
here is the starting situation:
1.5 floors
125 sqm (1350 sq ft)
36.5 cm (14 inches) Ytong blocks
gable roof with 45° pitch including dormer
a decentralized heat recovery ventilation system is also planned.
and if I understood correctly, a primary energy demand of 77.3 kWh/m² (7.18 kWh/sq ft) or another figure of 22.2 kWh/m² (2.06 kWh/sq ft) according to the energy saving ordinance. I assume the second figure applies?
We will probably install radiators (underfloor heating is likely ruled out for now, reasons are not that important at this stage) and our general contractor recently said it might be possible to operate the air-to-water heat pump with radiators. I don’t have much experience here. I know that with an air-to-water heat pump, the flow temperature should be as low as possible.
So the options are:
An air-to-water heat pump (Rotex HPSU Compact 308) + radiators + a "small" photovoltaic system (I'll arrange this myself)
or a gas boiler + solar panels about 5 m² (54 sq ft) (Vaillant auroCompact, size between 3.3 and 14.7 kW still to be determined, including a 150-liter (40 US gallon) stratified storage tank) + a somewhat smaller photovoltaic system (due to space needed for solar hot water).
What is not entirely clear to me is whether the solar panels also cover heating or only domestic hot water.
Which solution would make the most sense in this situation? Advantages / disadvantages?
Currently, I tend toward gas, even though we still have to budget for the gas connection costs here.
I briefly spoke with the photovoltaic provider as well... he said that under the new 2016 regulation photovoltaic systems are taken into account... unfortunately, he only has his training next week and can give me more details then... in his opinion, that might make the solar thermal system unnecessary and we could install more photovoltaics instead.
Best regards to all
So, we have been thinking about something simple… Underfloor heating is definitely an option. As you can see, we are still quite uncertain about the heating system.
Would a heat pump (air-to-water) combined with underfloor heating be the better solution? This means a lower flow temperature, which is supposed to be advantageous.
Additionally, we have planned photovoltaic panels… I can only roughly estimate the size at 5 kWp since the offer is not yet available.
I don’t want two meters because we want to use the photovoltaic electricity for the air-to-water heat pump as well. We plan to manage this with minimal effort by scheduling the hot water generation consistently between 2 p.m. and 4 p.m., since most photovoltaic output is expected during that time.
Do you think this will help keep the electricity and heating costs within limits? Many horror stories can be found on this topic.
Would a heat pump (air-to-water) combined with underfloor heating be the better solution? This means a lower flow temperature, which is supposed to be advantageous.
Additionally, we have planned photovoltaic panels… I can only roughly estimate the size at 5 kWp since the offer is not yet available.
I don’t want two meters because we want to use the photovoltaic electricity for the air-to-water heat pump as well. We plan to manage this with minimal effort by scheduling the hot water generation consistently between 2 p.m. and 4 p.m., since most photovoltaic output is expected during that time.
Do you think this will help keep the electricity and heating costs within limits? Many horror stories can be found on this topic.
First, you need a proper heating load calculation. Based on that, the overall concept will determine the heating capacity required for your heating system. If you build with a reasonably good standard, your demand will be below 5 kW at design temperature. In that case, a heat pump combined with underfloor heating is highly recommended. Additionally, a photovoltaic system can be used to generate "free" hot water during the summer.
This is just my suggestion, but for the living area you mentioned, an air-to-water heat pump should be a good fit, as long as you don’t live in the Alps.
This is just my suggestion, but for the living area you mentioned, an air-to-water heat pump should be a good fit, as long as you don’t live in the Alps.
B
Bieber08159 Mar 2017 06:32astron schrieb:
So would an air-to-water heat pump plus underfloor heating be the better solution? Honestly, I consider radiators the least favorable option and would recommend underfloor heating instead. I’m less familiar with alternatives like wall heating (or passive houses). Let’s use underfloor heating as the general term for surface heating systems. The supply water temperature should be designed to be as low as possible!
How the heat is generated (oil, liquefied gas, wood/pellets, natural gas, air-to-water heat pump, ground-source heat pump, etc.) is a separate decision. This can and should be chosen independently of the underfloor heating system. If budget is no issue and conditions are favorable, I would choose a ground-source heat pump with deep boreholes (instead of a surface collector), meaning geothermal energy. The next best alternatives for me are gas and air-to-water heat pumps. With gas, you have the connection and the chimney; with an air-to-water heat pump, usually an outdoor unit (space, noise) and not arbitrarily hot water (ask your installer) are the individual drawbacks.
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