ᐅ Replacing an Old Heating System with a Heat Pump or Gas Boiler Combined with a Domestic Hot Water Heat Pump
Created on: 5 May 2022 10:01
G
GePrest
Hello, my gas heating system (roof heating central unit) is 22 years old, as is the solar thermal system. The solar thermal system is no longer functioning properly. The first builder recommends demolishing both the heating system and the solar thermal system and installing a Weishaupt heat pump. He has been installing only Weishaupt products for several years. A second builder recommends renewing the gas boiler and additionally installing a domestic hot water heat pump. A photovoltaic system has been commissioned with 9 Luxor ECO LINE HALF-CELLS M120/380W modules, which will be expanded by at least 3 modules when the solar thermal system is removed. The property is a mid-terrace house, fully equipped with radiators, with 106 m² (1,141 sq ft) of living space, housing 4 people, and approximately 10,000 kWh annual gas consumption. Postal code 76661, average annual temperature 11.1°C (52°F), standard outdoor temperature -10°C (14°F). According to the builder, the heat pump is to be installed on the roof. Regarding the hybrid system: can I install the heat pump for domestic hot water in the basement even though there is no existing hot water pipe? How extensive would the work be if additional piping needs to be installed? Installation in the attic is not possible.
GePrest schrieb:
Thank you very much for all the information.Hello, yesterday another builder was on site. He said that the heat pump could definitely be installed in the front garden. The unit would be placed to the right, below the kitchen window. The often-mentioned 3-meter (10 feet) distance does not apply to the neighbor, but rather a 3-meter (10 feet) distance from public areas. I couldn’t find anything definitive on this topic in the Baden-Württemberg state building regulations. He wants to install a Vaillant Arotherm Split 75/5 or 55/5 with a storage tank. The installation site would be 1 meter (3 feet) from the nearest house. The municipality has no special regulations. Does anyone have experience or know of any rules or similar requirements? After entering the heat pump data into the sound calculator provided by the heat pump supplier, I received the following result:
Distance source - receiver: 2 m (6.5 ft)
At least one assessment level is less than 6 dB(A) below the immission guideline value. If applicable, noise emissions from other sources ("preloading") must be taken into account.
Daytime operation
Assessment level Lr: 51 dB(A)
✔ Exceeds the TA Lärm immission guideline value by 4 dB(A) (TA Lärm refers to the Technical Instruction on Noise Protection).
- Assessment level compared to TA Lärm limit value (immission guideline value) according to TA Lärm
Nighttime operation
(with noise reduction)
Assessment level Lr: 37 dB(A)
✔ Exceeds the TA Lärm immission guideline value by 3 dB(A)
What exactly does this mean? The heat pump will be installed facing the street.
Distance source - receiver: 2 m (6.5 ft)
At least one assessment level is less than 6 dB(A) below the immission guideline value. If applicable, noise emissions from other sources ("preloading") must be taken into account.
Daytime operation
Assessment level Lr: 51 dB(A)
✔ Exceeds the TA Lärm immission guideline value by 4 dB(A) (TA Lärm refers to the Technical Instruction on Noise Protection).
- Assessment level compared to TA Lärm limit value (immission guideline value) according to TA Lärm
Nighttime operation
(with noise reduction)
Assessment level Lr: 37 dB(A)
✔ Exceeds the TA Lärm immission guideline value by 3 dB(A)
What exactly does this mean? The heat pump will be installed facing the street.
Offer for aroTHERM 75/5 approximately €39,400. Note: Installation through roof window, roof window will be removed on site. Opening 60cm wide (24 inches). Storage tank 60cm wide (24 inches), potential damage to the tank insulation is unavoidable.
Provide and supply a roofer’s crane Böcker AK37/4000 including operator
1 day €950
Surcharge for piping with Isogenopack insulation. Dimension/insulation thickness 15-22/20
20 m (22 yards) €12.75 per meter
N.E.P.
5.004
Surcharge for piping with Isogenopack insulation. Dimension/insulation thickness 28/30
20 m (22 yards) €14.40 per meter
N.E.P.
Total chapter 5 €679.60
Chapter 6
Calculation of heating load – hydraulic balancing – acoustical report
6.001
Energy planning by the expert office Kühlthau, especially design, sizing, and checking of heat transferring heating surfaces, calculation of room-specific heating loads according to Optimus, and calculation of hydraulic balancing according to VdZ B, the advanced procedure
6.002
Hydraulic balancing per radiator consisting of:
1x supply and return fittings, 1x thermostat head with zero position, 1x installation
1 unit €106.46 N.E.P.
6.003
Cost estimate for acoustical report without on-site appointment.
1 unit €1,584.72
To be provided on site: development plan/planning permission, floor plans of the affected houses, building components of the affected houses (windows, masonry, roller shutter housings).
Other: marking of heat pump, machine data.
Very high price, partly €1,000 more for buffer tank. Heat pump €11,546 all net.
That doesn’t seem cost-effective, does it?
Provide and supply a roofer’s crane Böcker AK37/4000 including operator
1 day €950
Surcharge for piping with Isogenopack insulation. Dimension/insulation thickness 15-22/20
20 m (22 yards) €12.75 per meter
N.E.P.
5.004
Surcharge for piping with Isogenopack insulation. Dimension/insulation thickness 28/30
20 m (22 yards) €14.40 per meter
N.E.P.
Total chapter 5 €679.60
Chapter 6
Calculation of heating load – hydraulic balancing – acoustical report
6.001
Energy planning by the expert office Kühlthau, especially design, sizing, and checking of heat transferring heating surfaces, calculation of room-specific heating loads according to Optimus, and calculation of hydraulic balancing according to VdZ B, the advanced procedure
6.002
Hydraulic balancing per radiator consisting of:
1x supply and return fittings, 1x thermostat head with zero position, 1x installation
1 unit €106.46 N.E.P.
6.003
Cost estimate for acoustical report without on-site appointment.
1 unit €1,584.72
To be provided on site: development plan/planning permission, floor plans of the affected houses, building components of the affected houses (windows, masonry, roller shutter housings).
Other: marking of heat pump, machine data.
Very high price, partly €1,000 more for buffer tank. Heat pump €11,546 all net.
That doesn’t seem cost-effective, does it?
GePrest schrieb:
Offer for aroTHERM 75/5 approximately €39,400. Note: Installation through roof window; roof window will be removed on-site. Opening 60cm wide (24 inches). Storage tank 60cm wide (24 inches); possible damage to storage tank insulation is unavoidable.
Delivery and provision of a roofer crane Böcker AK37/4000 including operator
1 day €950
Additional charge for piping equipped with Isogenopack. Dimension/insulation thickness 15–22/20 (0.6–0.9/0.8 inches)
20 m (22 yards) €12.75
N.E.P.
5.004
Additional charge for piping equipped with Isogenopack. Dimension/insulation thickness 28/30 (1.1/1.2 inches)
20 m (22 yards) €14.40
N.E.P.
Total item 5 €679.60
Item 6
Heating load calculation – hydraulic balancing – acoustic assessment
6.001
Energy planning by the expert office Kühlthau, especially design, dimensioning, and verification of the heat-transferring heating surfaces; calculation of room-specific heating load according to Optimus and calculation of hydraulic balancing according to VdZ B, the advanced method
6.002
Hydraulic balancing per radiator consisting of:
1x flow and return valve fittings 1x thermostat head with zero position 1x installation
1 pc €106.46 N.E.P.
6.003
Cost estimate for acoustic assessment without on-site appointment.
1 pc €1,584.72
On-site documentation to be provided includes development plan, floor plans of the affected buildings, components of the affected buildings (windows, masonry, roller shutter boxes).
Other: Mark-up heat pump, machine data.
Very high price, partly €1,000 more for buffer tank. Heat pump €11,546 all net.
This doesn’t seem cost-effective, does it? The offer will increase by another €3,000–4,000. Regarding the heat pump on the pitched roof between the gables, it was mentioned in another forum that it’s acceptable to install the heat pump there because the noise is barely noticeable even inside the storage tank. The sound is directed upwards by the other roof. If that’s the case, I would choose this option. Does anyone have experience with this situation between two roofs?
Hello, I just spoke with the builder; he had a call with Weishaupt, and the Weishaupt representative suggested a second option: installing the heat pump mounted on the wall on the street side. According to the representative, this option would be the most suitable. What do you think? Would this be a good choice?
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