Hello everyone,
I have a question regarding a heating system renovation. I am new here and hope this is the right place for my inquiry.
We are currently planning to modernize our heating system. Our house was built in 1995, conventional construction, Poroton bricks, underfloor heating, about 220m² (2,368 sq ft).
We are currently heating with oil (consumption about 4000 liters/year (1057 gallons)), without a condensing boiler.
We are refinancing at the moment and would like to remove the oil heating system to get rid of the oil tanks and later convert the gained space into living areas.
As options, gas or a geothermal heat pump have emerged. Air-to-water heat pumps are not an option since we do not want an outdoor unit. Gas could be connected to the house for under 2000 euros, the investment is manageable, but it would still mean relying on a fossil fuel. According to our quotes, converting to gas would cost around 16,000 euros.
Geothermal would be possible for us. Our neighbor has a borehole of about 100 meters (328 feet). I do not know the details. According to our quotes, we expect costs around 35,000 euros. The drilling company offered a borehole with 3 x 45 meters (3 x 148 feet), 3 x 15 kW.
Now, I have no idea how to evaluate this borehole or if it is sufficient. It confuses me that the neighbor only has the one borehole, which goes significantly deeper.
In principle, we are also unsure whether the considerably higher investment will ever pay off (apart from the gas dependency). Our neighbor uses about 50-60 euros of electricity per month for his heat pump but has a low-energy house with a ventilation system. We have generally left out subsidies for now. The region of Hesse offers discounted electricity tariffs for heat pumps.
Perhaps someone can give us an assessment to help us with our decision-making. We would really appreciate it.
Best regards
Christian Kumpf
I have a question regarding a heating system renovation. I am new here and hope this is the right place for my inquiry.
We are currently planning to modernize our heating system. Our house was built in 1995, conventional construction, Poroton bricks, underfloor heating, about 220m² (2,368 sq ft).
We are currently heating with oil (consumption about 4000 liters/year (1057 gallons)), without a condensing boiler.
We are refinancing at the moment and would like to remove the oil heating system to get rid of the oil tanks and later convert the gained space into living areas.
As options, gas or a geothermal heat pump have emerged. Air-to-water heat pumps are not an option since we do not want an outdoor unit. Gas could be connected to the house for under 2000 euros, the investment is manageable, but it would still mean relying on a fossil fuel. According to our quotes, converting to gas would cost around 16,000 euros.
Geothermal would be possible for us. Our neighbor has a borehole of about 100 meters (328 feet). I do not know the details. According to our quotes, we expect costs around 35,000 euros. The drilling company offered a borehole with 3 x 45 meters (3 x 148 feet), 3 x 15 kW.
Now, I have no idea how to evaluate this borehole or if it is sufficient. It confuses me that the neighbor only has the one borehole, which goes significantly deeper.
In principle, we are also unsure whether the considerably higher investment will ever pay off (apart from the gas dependency). Our neighbor uses about 50-60 euros of electricity per month for his heat pump but has a low-energy house with a ventilation system. We have generally left out subsidies for now. The region of Hesse offers discounted electricity tariffs for heat pumps.
Perhaps someone can give us an assessment to help us with our decision-making. We would really appreciate it.
Best regards
Christian Kumpf
Please think this through calmly. Geothermal heat is feasible. However, the heat pump system must be designed for low supply temperatures, using closely spaced loops, and the house must be well to excellently insulated. Does this apply to your older building? If you have any doubts, don’t hesitate to order gas. k.
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smurf2657916 Mar 2019 21:55Nordlys schrieb:
Please think about this very rationally. Geothermal energy is possible. But the heat pump must be designed for low flow temperature with closely spaced pipes, and the house needs to be well to excellently insulated. Does this apply to your older building? If you have doubts, don’t hesitate to order gas. k.I’m not a professional, but I don’t think you can really call standard Poroton bricks insulation, can you? The flow temperature is definitely very low at the moment. I’m not sure what is meant by closely spaced pipes in the heat pump system, but the plan seems to show rather generous spacing...
This all argues more in favor of a proper gas heating system...
This question also concerns me. We want to renovate a house and bring it up to modern standards. My plan is to install a heat pump. However, the structural engineer suggested that gas should also be included as a backup. We haven’t worked out the details yet, so I’m interested to hear an explanation on this.
For me, it’s also important not to become dependent on a single fuel source.
For me, it’s also important not to become dependent on a single fuel source.
Either one or the other! Doing both at the same time is just wasted money.
With an existing building, a heat pump rarely pays off. Although a heat pump doesn’t make you directly dependent on gas, if gas eventually stops flowing through the pipeline, there also won’t be enough electricity available. You always need some energy source for heating.
If you want to be independent and self-sufficient, build a passive house with a proper photovoltaic system, a garden for self-supply, a chicken coop, and buy a good bicycle.
With an existing building, a heat pump rarely pays off. Although a heat pump doesn’t make you directly dependent on gas, if gas eventually stops flowing through the pipeline, there also won’t be enough electricity available. You always need some energy source for heating.
If you want to be independent and self-sufficient, build a passive house with a proper photovoltaic system, a garden for self-supply, a chicken coop, and buy a good bicycle.
B
boxandroof17 Mar 2019 00:39Niloa schrieb:
I also feel reluctant to depend on a single fuel source. Better to rely on one than on both.
You don’t want to combine the disadvantages of a heat pump with those of gas. Don’t agree to anything, no matter what clever arguments may be presented.
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