Hello 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?
H
hampshire21 Nov 2019 00:50guckuck2 schrieb:
Or change the supplier, because so far they have done everything wrong.That is a harsh judgment from a distance. By choosing "Ochsner," the supplier has certainly done many things right already. However, the size of the recommended hot water storage tank is surprisingly large. Including cooling is sensible.
Shading can be effectively supported with generous roof overhangs.
hampshire schrieb:
It is a harsh judgment from a distance. By choosing "Ochsner," the provider certainly got many things right. However, the size of the recommended hot water tank is surprisingly large.
Including cooling is a sensible measure.
Shading can be effectively supported with generous roof overhangs. Selecting a heat pump from a supplier’s catalog is not a qualification, nor is it the correct sequence of steps. A fool with a tool is still a fool.
Developing a sensible, efficient system design is one of the necessary qualifications, if not the most important one. And here, fundamentally wrong decisions were made, which can be assessed even from a distance.
Even the choice from the catalog was incorrect, as an oversized unit was selected.
N
neubau201921 Nov 2019 09:39Good morning everyone,
here is a small update from me. We have redesigned the system to use an air-to-water heat pump. In addition, a photovoltaic system with 9.9 kW (13.3 hp) will be installed. We will forego the cooling function because we have a good roof overhang and sufficient shading, and the cost is not worth it for 1-2 degrees.
here is a small update from me. We have redesigned the system to use an air-to-water heat pump. In addition, a photovoltaic system with 9.9 kW (13.3 hp) will be installed. We will forego the cooling function because we have a good roof overhang and sufficient shading, and the cost is not worth it for 1-2 degrees.
hampshire schrieb:Do you have experience with Ochsner heat pumps?
With the choice of "Ochsner," the provider has certainly done many things right.
hampshire schrieb:Yes, I agree; it will be significantly smaller.
The size of the recommended domestic hot water tank is surprisingly large.
guckuck2 schrieb:I agree with you! With a heat pump, regardless of the source, you have to plan carefully yourself, think things through, and not rely on others.
Selecting a heat pump from a supplier’s catalog is not a qualification and certainly not the proper sequence. A fool with a tool is still a fool. Creating a sensible, efficient system design is a necessary, if not the most important, qualification. And fundamentally wrong decisions have been made here, yes, that can be assessed even from a distance.
B
boxandroof21 Nov 2019 23:10No, I just wanted to share some information about cooling. We have a Panasonic 5kW (17,000 BTU) heat pump. It’s a good and popular unit at a low cost. Unfortunately, heating contractors rarely offer it. We bought it ourselves at our own risk and installed it next to the house without significant DIY work.
We use the cooling function by simply running it during the day with a timer when it’s sunny (photovoltaic). I set the timer myself as needed. However, it also has an automatic mode. It is only controlled by the outdoor temperature; there are no thermostats or controllers inside the house, neither for heating nor cooling. For cooling, I set the supply temperature fixed at 20°C (68°F) to ensure there is almost no risk of falling below the dew point.
We use the cooling function by simply running it during the day with a timer when it’s sunny (photovoltaic). I set the timer myself as needed. However, it also has an automatic mode. It is only controlled by the outdoor temperature; there are no thermostats or controllers inside the house, neither for heating nor cooling. For cooling, I set the supply temperature fixed at 20°C (68°F) to ensure there is almost no risk of falling below the dew point.
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