ᐅ Replacing the Heating System in an Older Home: Which Option Is Best?
Created on: 4 May 2020 14:51
T
tiborb
Hello everyone,
I need your advice on choosing the heating system for the planned replacement of our heating installation.
Facts:
- Semi-detached house with two separate living units, built in 1972, purchased by us in 2014
- Approx. 220 sqm (2370 sq ft) of heated space, 186 sqm (2002 sq ft) of living area, 95 sqm (1023 sq ft) on the ground floor, 91 sqm (979 sq ft) on the upper floor
- Building envelope insulated with 10 cm (4 inches)
- New triple-glazed windows, conservatories with full glazing on both ground and upper floors
- Roof not insulated
- Heating distribution: (We are currently planning to replace the old tube radiators with low-temperature radiators)
- Replacement of old oil heating from 1989 (low temperature), oil tank with 6000 liters (1585 gallons) steel tank, current consumption about 2500 liters (660 gallons) per year
- No gas connection available
- Additional planned project: photovoltaic system with about 8 – 9.9 kWp on the south side of the roof with a 10 kWh battery storage
- Ideally BAFA subsidy of 40% – 45% per system utilized
There have been many considerations regarding the options for the new heating system:
Option 1: Gas hybrid with solar thermal system of 8.5 sqm (91 sq ft) and 600-liter (160-gallon) water buffer tank
(Offers from Buderus or BOSCH systems)
Option 2: Gas hybrid with 400-liter (105-gallon) water tank and small supplementary air-water heat pump (possibly combined with the rooftop photovoltaic system)
(Offers from WOLF systems)
Option 3: Air-water heat pump with integrated domestic hot water preparation in the indoor unit and outdoor unit (possibly combined with the rooftop photovoltaic system)
(Offers from Vaillant systems)
Each option has its pros and cons, but I am also interested in your opinions and experiences. In particular, I am uncertain about the noise level of the outdoor units of the heat pumps. How loud are they really?
Or maybe some of you are currently planning a replacement with a similar setup. I would be glad to hear your experiences with these systems and which you would recommend for my situation.
Thank you very much for your help!!!
Best regards,
Chippy
I need your advice on choosing the heating system for the planned replacement of our heating installation.
Facts:
- Semi-detached house with two separate living units, built in 1972, purchased by us in 2014
- Approx. 220 sqm (2370 sq ft) of heated space, 186 sqm (2002 sq ft) of living area, 95 sqm (1023 sq ft) on the ground floor, 91 sqm (979 sq ft) on the upper floor
- Building envelope insulated with 10 cm (4 inches)
- New triple-glazed windows, conservatories with full glazing on both ground and upper floors
- Roof not insulated
- Heating distribution: (We are currently planning to replace the old tube radiators with low-temperature radiators)
- Basement: One old tube radiator and about 40 sqm (430 sq ft) of underfloor heating (old system – probably pipes will be reused)
- Ground floor: Underfloor heating with 9 loops, installed in 2014, conservatory still with old underfloor heating system like in the basement
- Upper floor: Six old tube radiators
- Replacement of old oil heating from 1989 (low temperature), oil tank with 6000 liters (1585 gallons) steel tank, current consumption about 2500 liters (660 gallons) per year
- No gas connection available
- Additional planned project: photovoltaic system with about 8 – 9.9 kWp on the south side of the roof with a 10 kWh battery storage
- Ideally BAFA subsidy of 40% – 45% per system utilized
There have been many considerations regarding the options for the new heating system:
Option 1: Gas hybrid with solar thermal system of 8.5 sqm (91 sq ft) and 600-liter (160-gallon) water buffer tank
(Offers from Buderus or BOSCH systems)
Option 2: Gas hybrid with 400-liter (105-gallon) water tank and small supplementary air-water heat pump (possibly combined with the rooftop photovoltaic system)
(Offers from WOLF systems)
Option 3: Air-water heat pump with integrated domestic hot water preparation in the indoor unit and outdoor unit (possibly combined with the rooftop photovoltaic system)
(Offers from Vaillant systems)
Each option has its pros and cons, but I am also interested in your opinions and experiences. In particular, I am uncertain about the noise level of the outdoor units of the heat pumps. How loud are they really?
Or maybe some of you are currently planning a replacement with a similar setup. I would be glad to hear your experiences with these systems and which you would recommend for my situation.
Thank you very much for your help!!!
Best regards,
Chippy
N
nordanney13 Jul 2020 13:55tiborb schrieb:
What do you think about the heating company's claim that with the Vaillant VWL 125/6 A heat pump and their COP calculation, no heating element will be needed? Either you are building on the Côte d’Azur or the heating company hasn’t considered cold winters. Ask them how the system is supposed to operate during a week of -10°C (14°F) if you actually need a flow temperature of 50-55°C (122-131°F).
I know several newer houses that are energetically much better than yours, yet they still require the heating element at -10°C (14°F) — and those heating systems are designed for around 30°C (86°F) flow temperature.
nordanney schrieb:
Either you are building on the Côte d’Azur, or the heating company didn’t consider cold winters. You should ask how the system is supposed to operate during a week at -10°C (14°F), when you might actually need a supply temperature of 50–55°C (122–131°F).
I know several new houses, which are energetically clearly better than your place, that require the electric heater at -10°C (14°F) – and their heating systems are designed for a supply temperature of around ±30°C (±86°F). Yes, okay, I will ask about that. However, it must be said that here in Munich we have actually had quite mild winters in recent years.
The average winter temperature, I believe, has been between +1.4 and +3.6°C (35 to 38°F). Even if the electric heater would be needed for a week at -16°C (3°F), it wouldn’t really "break us".
As mentioned, the heating company justified this by saying they sized the heat pump larger to avoid using the electric heater.
Best regards
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