ᐅ Is an air-to-water heat pump a practical option for renovating a listed building to meet Efficiency House standards (160% energy savings regulation)?
Created on: 14 Jan 2021 09:11
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RomeoZwo
Hello everyone,
This is about the renovation of a listed single-family house for rental purposes. According to the energy consultant (an architect specializing in renovations), using an air-to-water heat pump is recommended because a gas condensing boiler would require significantly more insulation work (internal insulation of 8cm (3 inches) instead of 4cm (1.5 inches)) and thus reduce the living space. The air-to-water heat pump could be installed in the basement, with air intake and exhaust through the former coal window (basement top edge about 80cm (31 inches) above ground level). Photovoltaic or solar thermal systems are not possible due to heritage protection. Until now, I had assumed a gas boiler for the house since there is a gas connection in the street, although it has not yet been connected to the house (original heating was a central coal heating system, but unused and unoccupied for 30 years).
As a rental property, it is also interesting that the green/red political plans to impose the CO2 tax on landlords would not be problematic in this case, since electricity costs are charged directly to the tenant and therefore initially would not appear in the additional costs.
On paper, the air-to-water heat pump is clearly advantageous, but what is the reality here? In 2017, we chose gas for a new build due to the high electricity consumption. This is an old building that is allowed to have up to 60% more primary energy demand than a new build. Can the figures for the air-to-water heat pump be trusted to some extent, or will the electricity consumption be a disaster?
Thanks in advance for your opinions—I had never really considered an air-to-water heat pump before and therefore haven't looked into it much yet.
This is about the renovation of a listed single-family house for rental purposes. According to the energy consultant (an architect specializing in renovations), using an air-to-water heat pump is recommended because a gas condensing boiler would require significantly more insulation work (internal insulation of 8cm (3 inches) instead of 4cm (1.5 inches)) and thus reduce the living space. The air-to-water heat pump could be installed in the basement, with air intake and exhaust through the former coal window (basement top edge about 80cm (31 inches) above ground level). Photovoltaic or solar thermal systems are not possible due to heritage protection. Until now, I had assumed a gas boiler for the house since there is a gas connection in the street, although it has not yet been connected to the house (original heating was a central coal heating system, but unused and unoccupied for 30 years).
As a rental property, it is also interesting that the green/red political plans to impose the CO2 tax on landlords would not be problematic in this case, since electricity costs are charged directly to the tenant and therefore initially would not appear in the additional costs.
On paper, the air-to-water heat pump is clearly advantageous, but what is the reality here? In 2017, we chose gas for a new build due to the high electricity consumption. This is an old building that is allowed to have up to 60% more primary energy demand than a new build. Can the figures for the air-to-water heat pump be trusted to some extent, or will the electricity consumption be a disaster?
Thanks in advance for your opinions—I had never really considered an air-to-water heat pump before and therefore haven't looked into it much yet.
Tolentino schrieb:
When renting out, due to the risk of "overclocking" caused by improper use of the heat recovery ventilation (HRV) system by tenants, I would no longer recommend a heat pump. Is it possible to prevent this, for example with password or PIN protection, or something similar? Or is it a setting that requires regular adjustments?
The ERR is legally required. An exemption is theoretically possible, but as far as I know, no one on this forum has reported a successful case of implementation without the ERR.
Technically, you can effectively disable the ERR by removing the actuators from the manifold. However, I doubt whether this is legally acceptable under tenancy law.
Technically, you can effectively disable the ERR by removing the actuators from the manifold. However, I doubt whether this is legally acceptable under tenancy law.
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WilderSueden15 Jan 2021 19:58Just a quick question for clarification: what exactly is the problem with the ERR?
Do I understand correctly that the issue is caused by setting the temperature too low in individual rooms, causing the valves to close, which then leads to heat buildup at the heat pump? This heat buildup triggers the heat pump to shut off, and the frequent switching on and off causes wear and tear? So, the adjusted behavior would be to heat one room strongly enough to keep the system running continuously?
Do I understand correctly that the issue is caused by setting the temperature too low in individual rooms, causing the valves to close, which then leads to heat buildup at the heat pump? This heat buildup triggers the heat pump to shut off, and the frequent switching on and off causes wear and tear? So, the adjusted behavior would be to heat one room strongly enough to keep the system running continuously?
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