ᐅ Air-to-water heat pump combined with photovoltaic panels or pellet heating with solar thermal system
Created on: 2 Jul 2016 22:12
G
Gugugu
Hello everyone,
I am about to start a construction project.
Single-family prefabricated house with a basement.
Heated area approximately 350 square meters (3,767 square feet).
Two adults and currently two children, possibly a third child to follow.
A controlled ventilation system is planned.
Putting aside the initial costs of the heating system,
which option will be more cost-effective in the long run for heating expenses?
An air-to-water heat pump possibly combined with photovoltaic panels?
Or a pellet heating system combined with solar thermal?
For your information, in my current quote the air-to-water heat pump including photovoltaic system costs 37,000, with the photovoltaic system priced at 20,000.
The pellet heating system including solar thermal is quoted at 21,500.
What do you think the ongoing heating costs will be for the house approximately?
What do you recommend?
I am about to start a construction project.
Single-family prefabricated house with a basement.
Heated area approximately 350 square meters (3,767 square feet).
Two adults and currently two children, possibly a third child to follow.
A controlled ventilation system is planned.
Putting aside the initial costs of the heating system,
which option will be more cost-effective in the long run for heating expenses?
An air-to-water heat pump possibly combined with photovoltaic panels?
Or a pellet heating system combined with solar thermal?
For your information, in my current quote the air-to-water heat pump including photovoltaic system costs 37,000, with the photovoltaic system priced at 20,000.
The pellet heating system including solar thermal is quoted at 21,500.
What do you think the ongoing heating costs will be for the house approximately?
What do you recommend?
B
Bieber08154 Jul 2016 14:56The higher the COP, the better.
IGORR schrieb:
How can you tell which ones are efficient? Sorry, I haven’t really looked into this topic…In that case, I would strongly advise against a heat pump. It’s a system that requires considerable learning and attention, especially if you want to avoid an unpleasant surprise on your electricity bill shortly afterwards.
I’m not against heat pumps. I have nothing against the technology, just against the lobby 😉 What you describe is usually the problem: poorly planned heat pump systems installed by technicians from the old school, who are great at installing gas and condensing boilers but don’t fully understand heat pump systems. Our installer (with over 15 branches in Germany) tried to sell us the same nonsense... heat pump, buffer tank, thermostats, hydraulic bypass valve, etc. Everything that kills efficiency but makes his life easier.
Why? Obviously, so he can avoid trouble during the warranty period, but that doesn’t make the system efficient. But it doesn’t matter, since the customer pays the electricity, not him. Heat pump systems don’t tolerate planning mistakes the way other heating systems do.
In the end, we decided against the heat pump for exactly these reasons. He wouldn’t agree to remove the buffer tank and the hydraulic bypass valve. I see no reason to finance that and then spend a lot of time optimizing the system afterwards. Even if gas and the heat pump had been priced the same, I still would have gone with it. But with an additional investment of €3000 (gas connection already included), which still needs to be financed, purely economic reasons spoke against it. I had considered a ground loop collector, but it’s difficult on our property. So contrary to my opinion just a few weeks ago, it ended up being gas.
I’m now planning for 10–15 years. After that, the heating system will probably be replaced by a new generation heat pump. Until then, I’ll invest the saved money elsewhere, like paying down debt.
Why? Obviously, so he can avoid trouble during the warranty period, but that doesn’t make the system efficient. But it doesn’t matter, since the customer pays the electricity, not him. Heat pump systems don’t tolerate planning mistakes the way other heating systems do.
In the end, we decided against the heat pump for exactly these reasons. He wouldn’t agree to remove the buffer tank and the hydraulic bypass valve. I see no reason to finance that and then spend a lot of time optimizing the system afterwards. Even if gas and the heat pump had been priced the same, I still would have gone with it. But with an additional investment of €3000 (gas connection already included), which still needs to be financed, purely economic reasons spoke against it. I had considered a ground loop collector, but it’s difficult on our property. So contrary to my opinion just a few weeks ago, it ended up being gas.
I’m now planning for 10–15 years. After that, the heating system will probably be replaced by a new generation heat pump. Until then, I’ll invest the saved money elsewhere, like paying down debt.
Your experience partly confirms mine – our home builder is also quite inexperienced with heat pumps and initially wanted to install thermostats, buffer tanks, etc., but was persuaded to drop those plans rather quickly – maybe too quickly (we now have 20mm (0.8 inches) underfloor heating pipes – but that’s fine).
In terms of cost – when including the government subsidy (BAFA funding) – the price is about the same as gas plus solar thermal, roughly 15,000 euros for heating (all included) and drilling.
Interestingly, what isn’t working so well for us is the brine temperature – even though the drilling operation was very experienced... the winter will be “interesting.”
In terms of cost – when including the government subsidy (BAFA funding) – the price is about the same as gas plus solar thermal, roughly 15,000 euros for heating (all included) and drilling.
Interestingly, what isn’t working so well for us is the brine temperature – even though the drilling operation was very experienced... the winter will be “interesting.”
At that price, I wouldn’t have hesitated either—it’s practically a giveaway. ☺ Just the drilling, 2x75m (2x246 feet), would have cost us €11,000. I would never have made that back with heating costs in this lifetime. Well... now we’ll see how the first winter goes. One advantage is that I don’t have to worry standing in front of the electricity meter when it’s below freezing.
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