ᐅ Gas Heating + Solar & Controlled Ventilation or Air-to-Water Heat Pump Energy Saving Regulation 2016
Created on: 21 Apr 2018 11:26
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Filstal
Hello everyone,
Since I am quite new here, I would like to provide some background information about my situation. Please excuse any gaps in my knowledge in advance, and I am happy to provide further details if needed.
I own a fairly flat plot of land with 400 sqm (4,305 sq ft) (gas connection available), on which a KfW 70 energy-efficient solid brick single-family house with a slab foundation (no basement) is planned. The house will have approximately 134 sqm (1,442 sq ft) of living space and 144 sqm (1,550 sq ft) of total floor area, spread over 1.5 stories. It will have a gable roof with a 30° pitch and a knee wall height of 1.50 m (4.9 ft). Due to a nearby railway line, increased sound insulation is required, so the exterior walls must be constructed with a thickness of 36.5 cm (14.4 inches).
The build will be carried out by a local general contractor who has provided me with two offers as follows:
Offer 1: Thermo solid masonry blocks S9, 36.5 cm (14.4 inches) thick, enhanced insulation in the roof/attic, a gas condensing wall boiler type Viessmann VITODENS 200-W with a 500-liter (132-gallon) storage tank, and Viessmann VITOSOL 200-F flat plate solar collectors. Controlled ventilation with heat recovery is provided by four decentralized ventilation units, along with standard compact radiators throughout the house. Airtightness testing will be performed using a blower door test. This build will comply with the Energy Saving Ordinance 2014 including the 2016 tightening.
Offer 2: Thermo solid masonry blocks SX 10, 36.5 cm (14.4 inches) thick, Bartl air-to-water compact heat pump ECO 3-6 LCI for indoor installation with an 800-liter (211-gallon) storage tank. Underfloor heating throughout the entire house. Vento ventilation systems installed at all windows and patio doors in living areas. Prepared for a future photovoltaic system installation. This build will comply with the Energy Saving Ordinance 2016.
In terms of price, the second offer is exactly €3,000 more expensive, which is offset by the gas connection cost required for the first offer.
Since I am quite uncertain about which heating system would be the, let’s say carefully, "better" option for this house and more economical in the long run, I would like to ask for your recommendations here. My secondary question is whether the compact heat pump makes sense or if a split system from the same manufacturer would be a better choice?
I do not want to start a general debate about whether gas or air-to-water heat pumps are better and am specifically focusing only on the air-to-water heat pump.
My general contractor is clearly leaning towards the air-to-water heat pump. Here is a link to the technical data of the air-to-water heat pump.
Best regards,
Filstal
Since I am quite new here, I would like to provide some background information about my situation. Please excuse any gaps in my knowledge in advance, and I am happy to provide further details if needed.
I own a fairly flat plot of land with 400 sqm (4,305 sq ft) (gas connection available), on which a KfW 70 energy-efficient solid brick single-family house with a slab foundation (no basement) is planned. The house will have approximately 134 sqm (1,442 sq ft) of living space and 144 sqm (1,550 sq ft) of total floor area, spread over 1.5 stories. It will have a gable roof with a 30° pitch and a knee wall height of 1.50 m (4.9 ft). Due to a nearby railway line, increased sound insulation is required, so the exterior walls must be constructed with a thickness of 36.5 cm (14.4 inches).
The build will be carried out by a local general contractor who has provided me with two offers as follows:
Offer 1: Thermo solid masonry blocks S9, 36.5 cm (14.4 inches) thick, enhanced insulation in the roof/attic, a gas condensing wall boiler type Viessmann VITODENS 200-W with a 500-liter (132-gallon) storage tank, and Viessmann VITOSOL 200-F flat plate solar collectors. Controlled ventilation with heat recovery is provided by four decentralized ventilation units, along with standard compact radiators throughout the house. Airtightness testing will be performed using a blower door test. This build will comply with the Energy Saving Ordinance 2014 including the 2016 tightening.
Offer 2: Thermo solid masonry blocks SX 10, 36.5 cm (14.4 inches) thick, Bartl air-to-water compact heat pump ECO 3-6 LCI for indoor installation with an 800-liter (211-gallon) storage tank. Underfloor heating throughout the entire house. Vento ventilation systems installed at all windows and patio doors in living areas. Prepared for a future photovoltaic system installation. This build will comply with the Energy Saving Ordinance 2016.
In terms of price, the second offer is exactly €3,000 more expensive, which is offset by the gas connection cost required for the first offer.
Since I am quite uncertain about which heating system would be the, let’s say carefully, "better" option for this house and more economical in the long run, I would like to ask for your recommendations here. My secondary question is whether the compact heat pump makes sense or if a split system from the same manufacturer would be a better choice?
I do not want to start a general debate about whether gas or air-to-water heat pumps are better and am specifically focusing only on the air-to-water heat pump.
My general contractor is clearly leaning towards the air-to-water heat pump. Here is a link to the technical data of the air-to-water heat pump.
Best regards,
Filstal
The air-to-water heat pump does not have an outdoor unit. Therefore, the size of the plot hardly matters. I don’t find either of the plans well thought out. The gas solution with radiators feels somewhat old-fashioned. In the second plan, the 800-liter (210-gallon) storage tanks are quite large—what is the reason for that?
Personally, I would avoid both ventilation options and instead opt for a proper centralized mechanical ventilation with heat recovery.
Personally, I would avoid both ventilation options and instead opt for a proper centralized mechanical ventilation with heat recovery.
markus270323 Apr 2018 10:20I will stay out of the other points, but if increased sound insulation is required, I strongly advise against decentralized controlled ventilation systems. Regardless of the wall construction, the fans always create a sound bridge.
For quiet locations, this is acceptable, but for higher requirements, a centralized controlled ventilation system is definitely recommended.
For quiet locations, this is acceptable, but for higher requirements, a centralized controlled ventilation system is definitely recommended.
A
andreashm23 Apr 2018 15:41Timber frame construction could also be an advantage for enhanced sound insulation. I am aware that prefabricated houses still face a lot of skepticism and even prejudice. I had those doubts myself until I visited some model homes. However, the days when prefabricated houses were cheap, papier-mâché-like structures are definitely over. In my opinion, they are a serious alternative to traditional solid construction. Both have pros and cons that need to be carefully considered.
andreashm schrieb:
Both have advantages and disadvantages that need to be carefully considered. Which, to return to the topic, also applies to the heating systems offered. To me, there is still too much inconsistency: why isn't example "1" also shown with underfloor heating (even if only to make comparison easier)?
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Alex85 schrieb:
An air-to-water heat pump installed indoors is better than a split system, provided you have enough indoor space for it.Hey Alex, what are the drawbacks of a split system compared to an indoor installation? Is it because of the refrigerant circuit and the need for regular inspections?
For indoor installations, keep in mind:
- Preferably install it at the building corner to avoid thermal short-circuiting
- If the heat pump is located in the basement, the floor must not hold (temporarily) rising seepage or groundwater, otherwise there could be issues with the basement’s waterproofing
These were our two reasons against indoor installation (building corner was okay and clay soil). So now it will probably be an outdoor unit, with an annoying tower in the front yard...
ruppsn schrieb:
Hey Alex,
what is the downside of a split system compared to an indoor unit? The refrigeration circuit and the need to have it checked regularly?Read one sentence further
Alex85 schrieb:
An air-to-water heat pump with indoor installation is better than a split system, as long as you have enough space inside.
In terms of appearance and noise levels, it is more comfortable.But your point is also valid.
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