ᐅ Prefabricated House Heating: Gas / Air Source Heat Pump / Underfloor Heating
Created on: 11 Sep 2015 01:45
G
Gatho
Hi!
We are currently planning a prefab house and are undecided between Bien-Zenker and Weberhaus. Both strongly promote the Proxon air-to-air heat pump. However, this option is no longer suitable for us. The more we research, the less convincing it seems.
We are now considering an air-to-water heat pump (with underfloor heating) combined with a mechanical ventilation system, or a gas condensing boiler system (also with underfloor heating), likewise combined with mechanical ventilation. Both options should allow for future preparation for a photovoltaic system, which can be installed later. Ground source heat pumps or pellet heating systems are unfortunately not an option due to the high initial investment costs.
The thermal insulation in prefab houses is generally quite good/high. For Bien-Zenker, we would build to KfW 70 standard, and for Weberhaus even to KfW 55.
We are unsure whether it is worth investing the extra cost in an air-to-water heat pump (e.g., LWZ 304 from Stiebel Eltron or THZ 304 from Tecalor), or if a well-established and proven gas condensing boiler might also be a good solution. What about the ongoing costs for maintenance and repairs?
The house will be built in Dortmund, will have no basement, and will have a living area of 130 to 140 m² (1400 to 1500 ft²).
At Weberhaus, the LWZ 304 (with underfloor heating) from Stiebel Eltron currently costs 8555 EUR (including mechanical ventilation) as a "special anniversary offer." We have not yet received an offer for a gas condensing boiler system—only for the air-to-air heat pump from Proxon, which we have already excluded. I have some concerns about the electricity costs in winter and the potential noise from the air-to-water heat pump. Of course, both gas and electricity prices are rising, but modern gas condensing boilers are also very efficient, and with a well-insulated prefab house, gas heating could be a cost-effective solution.
What would you recommend? Is there anything else we should consider? How significant are the maintenance costs in this comparison?
I would greatly appreciate any tips, suggestions, and opinions.
Best regards and thanks!
Gatho
We are currently planning a prefab house and are undecided between Bien-Zenker and Weberhaus. Both strongly promote the Proxon air-to-air heat pump. However, this option is no longer suitable for us. The more we research, the less convincing it seems.
We are now considering an air-to-water heat pump (with underfloor heating) combined with a mechanical ventilation system, or a gas condensing boiler system (also with underfloor heating), likewise combined with mechanical ventilation. Both options should allow for future preparation for a photovoltaic system, which can be installed later. Ground source heat pumps or pellet heating systems are unfortunately not an option due to the high initial investment costs.
The thermal insulation in prefab houses is generally quite good/high. For Bien-Zenker, we would build to KfW 70 standard, and for Weberhaus even to KfW 55.
We are unsure whether it is worth investing the extra cost in an air-to-water heat pump (e.g., LWZ 304 from Stiebel Eltron or THZ 304 from Tecalor), or if a well-established and proven gas condensing boiler might also be a good solution. What about the ongoing costs for maintenance and repairs?
The house will be built in Dortmund, will have no basement, and will have a living area of 130 to 140 m² (1400 to 1500 ft²).
At Weberhaus, the LWZ 304 (with underfloor heating) from Stiebel Eltron currently costs 8555 EUR (including mechanical ventilation) as a "special anniversary offer." We have not yet received an offer for a gas condensing boiler system—only for the air-to-air heat pump from Proxon, which we have already excluded. I have some concerns about the electricity costs in winter and the potential noise from the air-to-water heat pump. Of course, both gas and electricity prices are rising, but modern gas condensing boilers are also very efficient, and with a well-insulated prefab house, gas heating could be a cost-effective solution.
What would you recommend? Is there anything else we should consider? How significant are the maintenance costs in this comparison?
I would greatly appreciate any tips, suggestions, and opinions.
Best regards and thanks!
Gatho
Irgendwoabaier schrieb:
With the addition: 'if energy is fed into the grid' – you then have to calculate when and how much energy is fed in, and what the overall balance looks like over the year. This mainly depends on individual consumption behavior. Only when a large part of the energy for personal use is stored can you generalize again and consider the 30° south orientation as the optimal direction.I see the difference between photovoltaic and solar thermal systems as follows: Solar thermal systems for hot water are ineffective during the day when no hot water is needed and only need to work well in the morning and evening. Electricity demand is also high in the evening when residents are at home, but during the day you still have the option to feed the generated electricity into the grid, even if it's not as economical as using it directly. (Without a very expensive photovoltaic battery storage, the self-consumption rate is probably around 20-30%, and with storage, about 80%.)
It should also be considered that by feeding energy into the grid, you become a business owner and have more work involved with the tax declaration.
Bauexperte schrieb:
I am always waiting for users to share their experiences with brine-water heat pumps...jx7 schrieb:
I will be able to do that starting in September 2016.If everything goes well, I should be able to do the same around that time.
Just as the term air source heat pump is quite informal and does not specify the technology or design (air-to-air, air-to-water / variable speed, split system, etc.), the same applies to photovoltaic systems. Here, it is important to consider the type of modules: monocrystalline, polycrystalline, or amorphous. Especially amorphous modules tend to deliver more power under indirect lighting or cloudy conditions compared to the other types mentioned. It is definitely worth making a detailed comparison.
B
Bauexperte23 Oct 2015 11:24Hello,
That would be great!
a) What is the soil composition of your plot?
b) How deep was the drilling?
c) How much did the drilling cost?
d) How much did the system cost?
e) Were there any difficulties during the installation? If so, what kind?
f) How is the system to operate on a daily basis?
e) What are the costs relative to the heated floor area?
f) To be continued...
Basically, everything that might interest a prospective homeowner or, conversely, the reasons that led you to choose a ground source heat pump.
Partial statements scattered across different threads don’t help anyone, so it would be useful to have a concrete example to refer to permanently, knowing that your situation will not be exactly the same as other construction projects.
Thanks +
Best regards, Bauexperte
Saruss schrieb:
What kind of experience do you have with a ground source heat pump?
Mine has been running for about 16 months now, so I can at least share some initial impressions.
That would be great!
a) What is the soil composition of your plot?
b) How deep was the drilling?
c) How much did the drilling cost?
d) How much did the system cost?
e) Were there any difficulties during the installation? If so, what kind?
f) How is the system to operate on a daily basis?
e) What are the costs relative to the heated floor area?
f) To be continued...
Basically, everything that might interest a prospective homeowner or, conversely, the reasons that led you to choose a ground source heat pump.
Partial statements scattered across different threads don’t help anyone, so it would be useful to have a concrete example to refer to permanently, knowing that your situation will not be exactly the same as other construction projects.
Thanks +
Best regards, Bauexperte
Similar topics