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neubau201930 Aug 2019 11:53Hello everyone,
I would like to get your feedback on our offer for the heat pump and also your thoughts on groundwater heat pumps in general.
We are currently planning to use groundwater as the heat source and have received the following offer. It includes the complete installation of the underfloor heating, connection of the heat pump, etc. Only the drilling for the two wells would be an additional cost.
Water-water heat pump Ochsner GMWW 11 plus
Ochsner buffer tank PU800
Ochsner domestic hot water module
230 sqm (2,475 sq ft) underfloor heating including insulation
Various small components such as room thermostats, etc.
The total price is €30,100 gross.
What do you think? Is this a good offer? Is a groundwater heat pump a sensible choice?
I would like to get your feedback on our offer for the heat pump and also your thoughts on groundwater heat pumps in general.
We are currently planning to use groundwater as the heat source and have received the following offer. It includes the complete installation of the underfloor heating, connection of the heat pump, etc. Only the drilling for the two wells would be an additional cost.
Water-water heat pump Ochsner GMWW 11 plus
Ochsner buffer tank PU800
Ochsner domestic hot water module
230 sqm (2,475 sq ft) underfloor heating including insulation
Various small components such as room thermostats, etc.
The total price is €30,100 gross.
What do you think? Is this a good offer? Is a groundwater heat pump a sensible choice?
N
neubau201930 Aug 2019 13:07Unfortunately, our plot does not provide enough space for that. There will only be about 180 sqm (approximately 1,940 sq ft) of garden left, and part of it will remain undeveloped.
A groundwater heat pump is the most efficient option you can choose.
Are you sure this is allowed by your local building permit / planning permission? Do you have an idea how deep the drilling will need to be?
What type of building is this for? Any special requirements regarding hot water demand? For a newly built single-family home with 230 m² (2,475 sq ft), the system would probably be oversized. Has a heating load calculation been done?
Why do you need an 800-liter (210-gallon) storage tank? Is someone planning to connect solar thermal to a heat pump? That would be quite unusual. Ochsner recommends 30 liters (8 gallons) per kW, which would mean 300 liters (79 gallons) for your system, not 800. Also, make sure the tank is not intended to serve as a heating buffer as well.
Overall, assuming a single-family home with normal consumption, €5,000 would be too expensive for me. But that might be within regional price variations—where are you building?
Are you sure this is allowed by your local building permit / planning permission? Do you have an idea how deep the drilling will need to be?
What type of building is this for? Any special requirements regarding hot water demand? For a newly built single-family home with 230 m² (2,475 sq ft), the system would probably be oversized. Has a heating load calculation been done?
Why do you need an 800-liter (210-gallon) storage tank? Is someone planning to connect solar thermal to a heat pump? That would be quite unusual. Ochsner recommends 30 liters (8 gallons) per kW, which would mean 300 liters (79 gallons) for your system, not 800. Also, make sure the tank is not intended to serve as a heating buffer as well.
Overall, assuming a single-family home with normal consumption, €5,000 would be too expensive for me. But that might be within regional price variations—where are you building?
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boxandroof30 Aug 2019 13:22A storage tank is necessary for the fresh water station and can be installed. However, the storage tank should not be used as a buffer for the heating circuit.
Groundwater: the groundwater pump can potentially consume a lot of electricity, which may reduce the otherwise likely good efficiency (if everything runs well). This can be avoided with the lift principle.
The heat pump is definitely oversized. Is it at least modulating? Is the groundwater suitable?
Common recommendations:
- no buffer tank
- design underfloor heating for low supply temperatures (<=30°C (86°F)), verify everything yourself
- deactivate individual room control by move-in at the latest
Groundwater: the groundwater pump can potentially consume a lot of electricity, which may reduce the otherwise likely good efficiency (if everything runs well). This can be avoided with the lift principle.
The heat pump is definitely oversized. Is it at least modulating? Is the groundwater suitable?
Common recommendations:
- no buffer tank
- design underfloor heating for low supply temperatures (<=30°C (86°F)), verify everything yourself
- deactivate individual room control by move-in at the latest
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neubau201930 Aug 2019 13:28I have already been in contact with the responsible water management authority, and obtaining a permit/planning permission is not an issue. Drilling would need to be about 12 meters deep (39 feet). I’m just wondering if operating the pump would be cost-effective.
The heating engineer is working on the heating load calculation; I haven’t received it yet. The building is not built to KfW standards; it will be a solid brick house made with 36.5 cm (14.4 inches) insulated MZ-70 bricks.
What do you mean by the €5000, or how did you arrive at that amount?
We are building in Bavaria, Landsberg district.
The heating engineer is working on the heating load calculation; I haven’t received it yet. The building is not built to KfW standards; it will be a solid brick house made with 36.5 cm (14.4 inches) insulated MZ-70 bricks.
What do you mean by the €5000, or how did you arrive at that amount?
We are building in Bavaria, Landsberg district.
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