ᐅ Heat Pump Energy Consumption in 2019 on a Monthly Basis

Bookstar schrieb:

[...] about 30 years payback period compared to air-to-water heat pump [...] That’s why brine systems remain something for enthusiasts [...]

I can’t leave it at that.

The quotes we received from the heating contractor were:

• Air-to-water heat pump around 9,000 € (including installation)
• Brine-to-water heat pump around 12,000 € (including installation)

Ground heat installation, done by ourselves, around 3,000 € total
BAFA subsidy 4,500 €

This leaves a net difference of 1,500 €.
We will recover that within a few years and additionally do “something” good for the environment.

@truce
Have you determined the annual performance factor?
How was the heat source identified for the modulating heat pump, and did it cause any issues with the parties involved?
What is the size of the domestic hot water storage tank?

Wow, those are some prices that will make my wallet jealous.

guckuck2 schrieb:

@truce
1. Have you determined the annual performance factor (APF)?
2. How was the heat source for the modulating heat pump determined, and did it cause any issues with the parties involved?
3. Size of the domestic hot water tank?

1. Yes, but due to the relatively higher share of domestic hot water production compared to less insulated houses, the annual performance factor is just below 5 (currently 4.86).

2. The source was designed based on the heating load determined before construction (approximately 6–7 kW). In hindsight, the source could have been slightly larger. Currently, the brine inlet and outlet temperatures are 4.2°C (39.6°F) and -0.4°C (31.3°F).

3. 190 liters (50 gallons) and no additional buffer tank (with good photovoltaic feed-in, 1–2 K [1.8–3.6°F] more heat is stored in the screed, causing slight overheating).

Oh, I thought you meant drilling! Well, then that's great.