N
Nikitierchen9 Aug 2019 13:19Hello,
I am going to build a new house of about 150m² (1,615 ft²) and I have a difficult decision to make. I was offered the following options for heating:
1. Vaillant gas condensing boiler compact unit + solar thermal system + decentralized ventilation with heat recovery
or
2. Rotex 8kW air source heat pump + ventilation WITHOUT heat recovery and without solar thermal system
Both options are apparently almost the same price. I might even save money with the heat pump because I don’t need a gas connection. How would you decide?
At the moment, I am leaning towards the air source heat pump. Would that be the right choice?
Thank you in advance and please be kind. This is my first post.
I am going to build a new house of about 150m² (1,615 ft²) and I have a difficult decision to make. I was offered the following options for heating:
1. Vaillant gas condensing boiler compact unit + solar thermal system + decentralized ventilation with heat recovery
or
2. Rotex 8kW air source heat pump + ventilation WITHOUT heat recovery and without solar thermal system
Both options are apparently almost the same price. I might even save money with the heat pump because I don’t need a gas connection. How would you decide?
At the moment, I am leaning towards the air source heat pump. Would that be the right choice?
Thank you in advance and please be kind. This is my first post.
I have never heard anything good about air source heat pumps here. I keep reading about high operating costs and insufficient comfort temperatures! Why do you want an air source heat pump, apart from the lower initial costs?
You’re not only saving on the gas connection but also on the underfloor heating—or do you mean an air-to-water heat pump?
You’re not only saving on the gas connection but also on the underfloor heating—or do you mean an air-to-water heat pump?
N
Nikitierchen9 Aug 2019 13:47Oh, sorry about that.
I took a closer look and can even tell you which device it is: Rotex HSPU compact Ultra 308
I hope this helps
I took a closer look and can even tell you which device it is: Rotex HSPU compact Ultra 308
I hope this helps
M
Mottenhausen9 Aug 2019 14:06Also "air-to-water heat pump" air-to-water heat pump.
We chose the classic option of gas heating combined with controlled residential ventilation and solar energy. No one knows what will happen in the future regarding, for example, CO2 taxes and electricity prices, so it is quite difficult to estimate at the moment. This will likely be an endless debate with valid arguments on both sides.
At the end of the day, climate change should be kept in mind, which, as of now, cannot be stopped. This means that over the next 10, 20, 30 years, average temperatures will continue to rise, and heating (regardless of the heating method) will become less and less important each year. On the other hand, thermal insulation—the building envelope, which also protects against external heat in summer—will become increasingly important (see record temperature peaks this year).
We chose the classic option of gas heating combined with controlled residential ventilation and solar energy. No one knows what will happen in the future regarding, for example, CO2 taxes and electricity prices, so it is quite difficult to estimate at the moment. This will likely be an endless debate with valid arguments on both sides.
At the end of the day, climate change should be kept in mind, which, as of now, cannot be stopped. This means that over the next 10, 20, 30 years, average temperatures will continue to rise, and heating (regardless of the heating method) will become less and less important each year. On the other hand, thermal insulation—the building envelope, which also protects against external heat in summer—will become increasingly important (see record temperature peaks this year).
B
boxandroof9 Aug 2019 15:00Air-to-water heat pump or ground-source heat pump with a trench collector plus government subsidy (Bafa) is, in my opinion, the most sensible heating option regarding operating and total costs, future viability, and environmental impact. Drilling instead of a trench collector is uneconomical but can be done if a trench collector (self-installed) is not possible or if the outdoor unit of an air-to-water heat pump is considered noisy.
What could speak against a heat pump:
- high prices that the builder may charge
- the risk of poor planning: sizing, hydraulics, underfloor heating design
You should supervise the planning yourself and research common mistakes in forums beforehand to ensure success. With poor planning, the heat pump may be oversized, cycle frequently, and/or perform less efficiently if the heat emitter system is not designed for relatively low flow temperatures: additional costs from 0 up to 1000€ (about 1100 USD) per year compared to optimal planning are all possible.
Gas systems are more tolerant of planning errors. Under no circumstances should you use complicated combined units with both a heat pump and ventilation.
Why should ventilation be without heat recovery in the option with a heat pump? Doesn’t the heat pump use the exhaust air, or is a different or no ventilation system used in this option to match the price? That would be misleading.
Independent of the heating system:
- Ventilation is a comfort feature and involves a one-time purchase cost that is usually not recouped through energy savings. I would consider and decide on ventilation separately from heating: central, decentralized, natural, with or without heat recovery.
- Photovoltaic panels are a useful addition, especially—but not only—with heat pumps. At present, photovoltaic systems pay off on their own mainly due to subsidies. There is no financial reason to avoid photovoltaic installation.
What could speak against a heat pump:
- high prices that the builder may charge
- the risk of poor planning: sizing, hydraulics, underfloor heating design
You should supervise the planning yourself and research common mistakes in forums beforehand to ensure success. With poor planning, the heat pump may be oversized, cycle frequently, and/or perform less efficiently if the heat emitter system is not designed for relatively low flow temperatures: additional costs from 0 up to 1000€ (about 1100 USD) per year compared to optimal planning are all possible.
Gas systems are more tolerant of planning errors. Under no circumstances should you use complicated combined units with both a heat pump and ventilation.
Why should ventilation be without heat recovery in the option with a heat pump? Doesn’t the heat pump use the exhaust air, or is a different or no ventilation system used in this option to match the price? That would be misleading.
Independent of the heating system:
- Ventilation is a comfort feature and involves a one-time purchase cost that is usually not recouped through energy savings. I would consider and decide on ventilation separately from heating: central, decentralized, natural, with or without heat recovery.
- Photovoltaic panels are a useful addition, especially—but not only—with heat pumps. At present, photovoltaic systems pay off on their own mainly due to subsidies. There is no financial reason to avoid photovoltaic installation.
Similar topics