tOkra1984
2022-07-21 10:50:15
- #1
Hello,
I am Thomas and in 2018 we bought an existing property.
The year of construction was 1968.
In 2001, the ground floor (partly underground, due to hillside location) was renovated and a larger extension was accomplished.
Altogether, the ground floor now has 150m² of living space. The extension is single-story (flat roof, greened) and insulated with PUR. Everything according to good standards with KNX etc.
The rest of the old building on the ground floor was also renovated (floor insulated, new wiring, etc.).
New windows (double-glazed) were installed throughout the ENTIRE house. Currently, heating and hot water preparation are provided by gas. A photovoltaic system with 9.9 kWp is present.
To summarize:
Ground floor: 150 m², underfloor heating everywhere except in one children’s room and the bedroom - there are radiators there. A split air conditioning system will also be installed.
1st floor: approx. 70 m², only radiators. Here, too, a split air conditioner with a good COP will be installed for possible heating. Currently, this floor is hardly inhabited.
2nd floor: converted attic with say 50 m². Only radiators. The floor is unoccupied and probably never will be. It serves as storage space or similar. I am not aiming for absolute comfort temperature here. The roof is old but insulated with wood fibers.
According to the energy certificate at the time of purchase, the building has a final energy demand of 70.2 kWh/m².
The heat from the ground floor is almost sufficient for the 1st floor (through the ceiling).
As a quick solution to reduce gas usage, I will soon receive the 2 split air conditioning units.
Next year or so I would like to have a heat pump installed. For the ground floor, I am actually not worried that a low flow temperature will be sufficient. On the 1st floor, I would then have the split air conditioner to catch peak loads. Yes, I know it’s also a heat pump but the flow temperature of the heating heat pump should be kept to a minimum.
I will submit the application to BAFA this week for the split air conditioner and the air-water heat pump.
Now to my first questions (there may be more over time :) ):
1. My technical room is very small and when the builder came for inspection he immediately said "oh dear, we won’t get a buffer tank in here." I have read a lot here and some say that a buffer tank makes little sense anyway. So I would waive the buffer tank. But this is irrelevant for the BAFA subsidy or is it a requirement for the funding?
2. At the next meeting with the builder, I want to have concrete ideas for myself. As far as I have read, a 300l hot water tank would be reasonable for me (2 adults, 2 children currently).
3. What output should the air/water heat pump deliver approximately in my case?
4. Currently, my gas boiler heats the hot water to 60°. Can I safely reduce this to 50° (keyword: legionella)?
I’m sure I’ll think of more but I just wanted to start a thread now - I can expand it.
I am grateful for any tips.
I am Thomas and in 2018 we bought an existing property.
The year of construction was 1968.
In 2001, the ground floor (partly underground, due to hillside location) was renovated and a larger extension was accomplished.
Altogether, the ground floor now has 150m² of living space. The extension is single-story (flat roof, greened) and insulated with PUR. Everything according to good standards with KNX etc.
The rest of the old building on the ground floor was also renovated (floor insulated, new wiring, etc.).
New windows (double-glazed) were installed throughout the ENTIRE house. Currently, heating and hot water preparation are provided by gas. A photovoltaic system with 9.9 kWp is present.
To summarize:
Ground floor: 150 m², underfloor heating everywhere except in one children’s room and the bedroom - there are radiators there. A split air conditioning system will also be installed.
1st floor: approx. 70 m², only radiators. Here, too, a split air conditioner with a good COP will be installed for possible heating. Currently, this floor is hardly inhabited.
2nd floor: converted attic with say 50 m². Only radiators. The floor is unoccupied and probably never will be. It serves as storage space or similar. I am not aiming for absolute comfort temperature here. The roof is old but insulated with wood fibers.
According to the energy certificate at the time of purchase, the building has a final energy demand of 70.2 kWh/m².
The heat from the ground floor is almost sufficient for the 1st floor (through the ceiling).
As a quick solution to reduce gas usage, I will soon receive the 2 split air conditioning units.
Next year or so I would like to have a heat pump installed. For the ground floor, I am actually not worried that a low flow temperature will be sufficient. On the 1st floor, I would then have the split air conditioner to catch peak loads. Yes, I know it’s also a heat pump but the flow temperature of the heating heat pump should be kept to a minimum.
I will submit the application to BAFA this week for the split air conditioner and the air-water heat pump.
Now to my first questions (there may be more over time :) ):
1. My technical room is very small and when the builder came for inspection he immediately said "oh dear, we won’t get a buffer tank in here." I have read a lot here and some say that a buffer tank makes little sense anyway. So I would waive the buffer tank. But this is irrelevant for the BAFA subsidy or is it a requirement for the funding?
2. At the next meeting with the builder, I want to have concrete ideas for myself. As far as I have read, a 300l hot water tank would be reasonable for me (2 adults, 2 children currently).
3. What output should the air/water heat pump deliver approximately in my case?
4. Currently, my gas boiler heats the hot water to 60°. Can I safely reduce this to 50° (keyword: legionella)?
I’m sure I’ll think of more but I just wanted to start a thread now - I can expand it.
I am grateful for any tips.