Good day,
I am currently planning a new heating system in North Rhine-Westphalia and have received several quotes.
At the moment, a gas heating system is in use, which will soon need to be replaced. The plan is to replace it with a heat pump.
The heat distribution system is underfloor heating covering 190 m² (2,045 sq ft) over two levels, and radiator heating for an outbuilding of about 40 m² (430 sq ft), which is usually only heated minimally (maintained between approximately 4 and 8°C (39°F to 46°F) during winter).
Additionally, a photovoltaic system of around 10 kWp, with the option to expand in the future, will be installed.
Currently, I have the following five estimates, which differ greatly both technically and in price.
(All prices include VAT.)
As a layperson, I naturally have little knowledge in this area and would appreciate advice on which offer is reasonable.
Furthermore, the various proposed heat pumps use different refrigerants: What should I pay attention to in this regard?
And more generally: What would you recommend?
Which brand is considered the best? Are there any that you would advise against?
Thank you very much in advance!
Best regards,
Lukas
1) Chofu with 16 kW (18,000 €)
(Installable this year)
CHOFU monoblock heat pump 16 kW
Refrigerant: R32
Switching valve
35 m (115 ft) piping
35 mm (1.4 inch) fittings
Including connection materials and installation
2) Bosch with 14.8 kW (26,400 €)
(Installable next January)
BOSCH split heat pump SAS 13-2 ASE, 14.8 kW, monovalent
Refrigerant: R410A
2x BOSCH remote controls/room controllers CR 10 H
BOSCH refrigerant lines SAS 3/8" and 5/8"
Wall mounting brackets for air/water heat pump
JUNKERS hot water switching valve 22-1 for heat pumps
Membrane expansion tank 25 l (6.6 gallons), silver, max. 3 bar
FLAMCO Flexcon suspension frame type MB 3
Logafix cap ball valve MK 3/4"
XStream vent-clean (DN20) K22
Pump group UK 1", without pump
Pump group MK 1", without pump
BOSCH mixing module MM 200 for 2 heating circuits
2x Grundfos circulation pumps Alpha1 25-60 180230V
2x Grundfos Alpha right-angle plugs, 4 m (13 ft) cable
Distributor bar for up to 3 heating circuits
BWT storage connection set 3/4" M KS 1267-34 M with 6 bar safety valve
Various pipes, fittings, and connectors
System filling according to ÖNORM
Work time: installation and connection of heat pump including accessories
Commissioning by factory service
3) IDM with 10 to 24 kW (45,000 €)
(Installable next March)
IDM AERO ALM heat pump 10-24 kW, modulating
Accessories AERO AL 10-24 (buffer tank, etc.)
Refrigerant: R290
3 x large-surface radiators
Various materials
Commissioning
Underfloor heating manifold
Small materials
Work time
4) IDM with 8 to 17 kW (30,000 €)
(Installable next December)
IDM AERO SLM heat pump 6-17 kW, with NAVIGATOR 2.0
Equipment variant HGL
Refrigerant: R410A
Commissioning
Room unit for one heating circuit to NAVIGATOR
EIB-KNX module
Air separator
Magnetic sludge separator
Refrigerant connection lines, length 5 m (16 ft)
Distributor for underfloor heating
5) Saunier Duval with 12 kW (25,000 €)
(Installable this October)
Saunier Duval heat pump with 12 kW
Refrigerant: R410A
3 x large-surface radiators
Various materials
Commissioning
Underfloor heating manifold
Work time
I am currently planning a new heating system in North Rhine-Westphalia and have received several quotes.
At the moment, a gas heating system is in use, which will soon need to be replaced. The plan is to replace it with a heat pump.
The heat distribution system is underfloor heating covering 190 m² (2,045 sq ft) over two levels, and radiator heating for an outbuilding of about 40 m² (430 sq ft), which is usually only heated minimally (maintained between approximately 4 and 8°C (39°F to 46°F) during winter).
Additionally, a photovoltaic system of around 10 kWp, with the option to expand in the future, will be installed.
Currently, I have the following five estimates, which differ greatly both technically and in price.
(All prices include VAT.)
As a layperson, I naturally have little knowledge in this area and would appreciate advice on which offer is reasonable.
Furthermore, the various proposed heat pumps use different refrigerants: What should I pay attention to in this regard?
And more generally: What would you recommend?
Which brand is considered the best? Are there any that you would advise against?
Thank you very much in advance!
Best regards,
Lukas
1) Chofu with 16 kW (18,000 €)
(Installable this year)
CHOFU monoblock heat pump 16 kW
Refrigerant: R32
Switching valve
35 m (115 ft) piping
35 mm (1.4 inch) fittings
Including connection materials and installation
2) Bosch with 14.8 kW (26,400 €)
(Installable next January)
BOSCH split heat pump SAS 13-2 ASE, 14.8 kW, monovalent
Refrigerant: R410A
2x BOSCH remote controls/room controllers CR 10 H
BOSCH refrigerant lines SAS 3/8" and 5/8"
Wall mounting brackets for air/water heat pump
JUNKERS hot water switching valve 22-1 for heat pumps
Membrane expansion tank 25 l (6.6 gallons), silver, max. 3 bar
FLAMCO Flexcon suspension frame type MB 3
Logafix cap ball valve MK 3/4"
XStream vent-clean (DN20) K22
Pump group UK 1", without pump
Pump group MK 1", without pump
BOSCH mixing module MM 200 for 2 heating circuits
2x Grundfos circulation pumps Alpha1 25-60 180230V
2x Grundfos Alpha right-angle plugs, 4 m (13 ft) cable
Distributor bar for up to 3 heating circuits
BWT storage connection set 3/4" M KS 1267-34 M with 6 bar safety valve
Various pipes, fittings, and connectors
System filling according to ÖNORM
Work time: installation and connection of heat pump including accessories
Commissioning by factory service
3) IDM with 10 to 24 kW (45,000 €)
(Installable next March)
IDM AERO ALM heat pump 10-24 kW, modulating
Accessories AERO AL 10-24 (buffer tank, etc.)
Refrigerant: R290
3 x large-surface radiators
Various materials
Commissioning
Underfloor heating manifold
Small materials
Work time
4) IDM with 8 to 17 kW (30,000 €)
(Installable next December)
IDM AERO SLM heat pump 6-17 kW, with NAVIGATOR 2.0
Equipment variant HGL
Refrigerant: R410A
Commissioning
Room unit for one heating circuit to NAVIGATOR
EIB-KNX module
Air separator
Magnetic sludge separator
Refrigerant connection lines, length 5 m (16 ft)
Distributor for underfloor heating
5) Saunier Duval with 12 kW (25,000 €)
(Installable this October)
Saunier Duval heat pump with 12 kW
Refrigerant: R410A
3 x large-surface radiators
Various materials
Commissioning
Underfloor heating manifold
Work time
L
Lukas453629 Aug 2022 00:12I have now looked at our gas consumption over the past 17 years (one bill is missing).
It has generally tended to remain stable, even though there were no major renovations or changes to the heating system during this time.
Does this explain the high heating demand?
It has generally tended to remain stable, even though there were no major renovations or changes to the heating system during this time.
Does this explain the high heating demand?
L
Lukas453629 Aug 2022 00:13Regarding the question of why the heating system is defective: It keeps going into fault mode, and the heating technician said that repairing it is no longer cost-effective, especially if you are already considering getting a new one.
L
Lukas453629 Aug 2022 00:29One more basic question: can I compensate for a (slight) oversizing by using a somewhat larger buffer?
L
Lukas453629 Aug 2022 00:50Another idea that could explain the high consumption: at least 300-400 liters (80-105 gallons) of hot water at 60°C (140°F) are used daily. How much does this contribute to the heating output?
S
SaniererNRW1239 Aug 2022 07:30Lukas45362 schrieb:
One more simple question: can I compensate for a (slight) oversizing with a somewhat larger buffer?The professional would slightly undersize and omit the buffer.Lukas45362 schrieb:
Another idea that could explain the high consumption: at least 300–400 liters of hot water at 60°C (140°F) are used per day. How much of the heating output does this represent? If you heat 400 liters from 10°C (50°F) to 60°C (140°F), that is about 20 kWh. Or 7,000 kWh per year. Based on the 32,000 kWh you mentioned, that’s roughly one fifth. By the way, that is equivalent to 3 large bathtubs every day. Do you have a hair salon or something similar?