Hello,
I have a well-insulated KFW40 house from 2014 with underfloor heating and 170m² (1830 ft²) using a Weishaupt gas boiler WTC 15 (heating + hot water).
The gas boiler has two heating circuits. One for the house and the other for the garage. The garage is connected via a district heating pipeline (about 8m (26 ft) from the house). The garage should only be kept frost-free.
My annual gas consumption (heating + hot water) was about 9700 kWh.
I believe my house is well suited for a heat pump. Unfortunately, I wasn’t that knowledgeable back then.
Now my questions.
1. Which type of heat pump would you recommend (ground source or air source)?
2. Where can I install the heat pump? A) Inside the house, where the gas boiler is now, or B) in the garage? Unfortunately, the heat pump could not produce hot water in the garage because there is only a cold water line to the garage. Or are there any solutions? I would prefer the garage otherwise.
I hope you can help.
Thank you.
I have a well-insulated KFW40 house from 2014 with underfloor heating and 170m² (1830 ft²) using a Weishaupt gas boiler WTC 15 (heating + hot water).
The gas boiler has two heating circuits. One for the house and the other for the garage. The garage is connected via a district heating pipeline (about 8m (26 ft) from the house). The garage should only be kept frost-free.
My annual gas consumption (heating + hot water) was about 9700 kWh.
I believe my house is well suited for a heat pump. Unfortunately, I wasn’t that knowledgeable back then.
Now my questions.
1. Which type of heat pump would you recommend (ground source or air source)?
2. Where can I install the heat pump? A) Inside the house, where the gas boiler is now, or B) in the garage? Unfortunately, the heat pump could not produce hot water in the garage because there is only a cold water line to the garage. Or are there any solutions? I would prefer the garage otherwise.
I hope you can help.
Thank you.
H
HilfeHilfe2 Aug 2022 07:14Vwgolfcabrio schrieb:
I already asked these questions.
1. Which heat pump would you recommend (ground-source or air-source)?
2. Where can I install the heat pump? A) inside the house, where the gas boiler is currently located, or B) in the garage? Unfortunately, the heat pump wouldn’t be able to produce hot water if placed in the garage, since only a cold water pipe runs there. Or are there any solutions? I would prefer the garage location otherwise.You should check with new housing developments in your area to see how these systems have been performing over the past 2–3 years.
We have fairly moderate temperatures, yet our heat pump failed twice in 8 years.
And as others have already pointed out, it’s worth doing the calculations! A heat pump still requires an energy source, which is electricity by the way! Keep in mind that costs for this may increase over time.
B
Benutzer 10012 Aug 2022 07:45A quick calculation to consider.
9000 kWh x $0.0015 per kWh gas cost equals €1350 per year.
The installation of an air-to-water heat pump roughly costs €20,000 based on current information, if there are any available at all.
The heat pump will cost you approximately €800–1000 per year in electricity. There are currently no special heat pump electricity tariffs available, except for older ones.
By the time you have saved €20,000, the heat pump will likely be out of order.
So, for now, it’s better to become familiar with the topic of hydraulic balancing. Lower the supply temperatures and reduce the domestic hot water temperatures.
Once you have optimized all of this, electricity prices will have surpassed gas prices.
9000 kWh x $0.0015 per kWh gas cost equals €1350 per year.
The installation of an air-to-water heat pump roughly costs €20,000 based on current information, if there are any available at all.
The heat pump will cost you approximately €800–1000 per year in electricity. There are currently no special heat pump electricity tariffs available, except for older ones.
By the time you have saved €20,000, the heat pump will likely be out of order.
So, for now, it’s better to become familiar with the topic of hydraulic balancing. Lower the supply temperatures and reduce the domestic hot water temperatures.
Once you have optimized all of this, electricity prices will have surpassed gas prices.
O
Oetzinger2 Aug 2022 07:52Currently, buying an air-to-water heat pump for a KfW 40 house is neither ecological nor economical nor sensible in any other way.
In the event of a gas outage, heat pumps will also be remotely shut down due to power grid overload.
In case of doubt, the air-to-water heat pump will be taken away from someone with an older building, who has twice the heating load as you and saves twice as much CO2 and gas as you do.
Much more important and urgent: your consumption sounds high for a KfW 40 standard. Has the hydraulic balancing been carried out, are the room thermostats deactivated, and has the heating curve been lowered to the minimum?
Has the domestic hot water temperature been reduced, and is the circulation pump either absent or only active for limited hours?
In the event of a gas outage, heat pumps will also be remotely shut down due to power grid overload.
In case of doubt, the air-to-water heat pump will be taken away from someone with an older building, who has twice the heating load as you and saves twice as much CO2 and gas as you do.
Much more important and urgent: your consumption sounds high for a KfW 40 standard. Has the hydraulic balancing been carried out, are the room thermostats deactivated, and has the heating curve been lowered to the minimum?
Has the domestic hot water temperature been reduced, and is the circulation pump either absent or only active for limited hours?
V
Vwgolfcabrio2 Aug 2022 14:01As an additional note, I have a 25kWp photovoltaic system with a 10kW battery storage. Therefore, an air-to-water heat pump should be even more worthwhile. Why are the outdoor units from German manufacturers so large, while those from East Asia are significantly smaller?
V
Vwgolfcabrio2 Aug 2022 14:07Joedreck schrieb:
Try googling your heating demand at home. I assume an air-to-water heat pump will easily be sufficient. However, that has already been mentioned.
I wouldn’t include the garage in the system but rather install a split air conditioning unit there. If it is only frost-free, that should be enough.
Use a monoblock heat pump. To size it properly, you need a heating load calculation.
Judging by the consumption including the garage, a 5 kW heat pump will easily suffice.
Also, read up on hydraulic balancing and setting the heating curve, and everything will run smoothly.
Oh, and with a monoblock, you don’t need an indoor unit.I looked up my heating demand — -12.4°C (9.7°F).
For the garage, I have a district heating connection and radiators are already installed. My garage is somewhat larger, with 3 rooms totaling 110 m² (1,184 ft²).
How is domestic hot water production handled with a monoblock system?
Vwgolfcabrio schrieb:
I looked up my NAT. -12.4°C (10.3°F).
There is a district heating pipe to the garage, and radiators are installed. My garage is a bit larger, with 3 rooms totaling 110 m² (1,184 ft²).
How is domestic hot water production handled with a monoblock system?By a switching valve controlled by the heat pump.Having radiators in the garage is a real efficiency killer for the heat pump.
How well is the garage insulated?
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