Hello everyone,
After reading quite a bit in the forum about different heating systems, I am increasingly convinced that I would like to install a gas condensing boiler. The concept of air source heat pumps does not convince me in cases of low temperatures, and ground or water source heat pumps are not allowed on the intended plot.
My current idea is as follows: gas heating + support for domestic hot water production through photovoltaic panels + a ventilation system with heat recovery.
The house will be about 150 sqm (1,615 sq ft). I have a few questions for you:
- Does this combination make sense?
- Why are solar thermal systems typically used? Do they have a better efficiency for water heating than photovoltaic? The advantage of photovoltaic would be that the electricity can also be used for other purposes...
- What about the costs? Is photovoltaic more expensive than solar thermal? How much does a ventilation system with heat recovery cost for a 150 sqm (1,615 sq ft) house?
Thanks in advance for your valuable help in this jungle.
Best regards,
Herr Stein
After reading quite a bit in the forum about different heating systems, I am increasingly convinced that I would like to install a gas condensing boiler. The concept of air source heat pumps does not convince me in cases of low temperatures, and ground or water source heat pumps are not allowed on the intended plot.
My current idea is as follows: gas heating + support for domestic hot water production through photovoltaic panels + a ventilation system with heat recovery.
The house will be about 150 sqm (1,615 sq ft). I have a few questions for you:
- Does this combination make sense?
- Why are solar thermal systems typically used? Do they have a better efficiency for water heating than photovoltaic? The advantage of photovoltaic would be that the electricity can also be used for other purposes...
- What about the costs? Is photovoltaic more expensive than solar thermal? How much does a ventilation system with heat recovery cost for a 150 sqm (1,615 sq ft) house?
Thanks in advance for your valuable help in this jungle.
Best regards,
Herr Stein
Alex85 schrieb:
Where exactly did someone suggest combining gas and a heat pump? Or am I missing something?
It doesn’t seem very sensible to me to install two (expensive) heating systems, especially if the focus is already on gas heating, where the hot water production is almost just a byproduct. What additional benefit would a heat pump provide?
Or are you mixing up a heat pump and a ventilation system with heat recovery?It’s not that far-fetched. We are currently working on similar calculations with our architect for the energy performance certificate.
A domestic hot water heat pump – which costs about 1000 to 1500€ (approximately $1100 to $1700) – could make it so that, with gas heating combined with controlled ventilation with heat recovery, a solar thermal system wouldn’t be necessary.
In that case, it’s definitely not “unwise” 😉
By "supply temperature," do you, @Cico1, also mean such a setup?
Which KfW standard are you aiming for, or just following the energy saving regulation?
Also calculate the costs for the installation space, labor, maintenance, and operating expenses (electricity instead of solar energy).
I find it a strange idea to install a heat pump alongside a 12 kW (16 hp) burner. But if the regulation requires it... as long as the (pseudo) renewable share is met, or where does the motivation come from?
Also calculate the costs for the installation space, labor, maintenance, and operating expenses (electricity instead of solar energy).
I find it a strange idea to install a heat pump alongside a 12 kW (16 hp) burner. But if the regulation requires it... as long as the (pseudo) renewable share is met, or where does the motivation come from?
matte1987 schrieb:
That’s not so far-fetched. We are currently discussing this with our architect while working on the energy saving regulation calculation.
A domestic hot water heat pump—available for about 1000 to 1500 euros—could mean that when using a gas boiler combined with a controlled mechanical ventilation system with heat recovery, a solar thermal system might not be necessary.
And then that’s not exactly “unwise” 😉
By “supply,” does @Cico1 also mean such a setup?That’s exactly what I meant.
Not purchasing solar thermal systems. I think they simply won’t be cost-effective.
There are also combination or hybrid units.
The heat pump operates during periods without heating demand. Once more heat is needed, the condensing boiler takes over.
I’m currently researching this topic.
Me? Just the energy saving regulation.
Of course, you have to factor that in somewhere, but then I also have to offset the buffer tank for the solar system including the costs of the system. Budgeting a flat 5,000€ is not a bad estimate, I think.
So that would mean an initial investment saving of around 3,500 to 4,000€.
The footprint will likely be smaller rather than larger, since such a buffer tank is not exactly small.
Work?
Maintenance is required for every heating system.
If I assume consumption costs of 200€/year for domestic hot water heating, which the solar system can never cover 100%, it still takes 15 to 20 years before I break even on the savings. Probably closer to 20, since the solar system produces nothing in winter and little in autumn and spring.
Of course, it’s not a cure-all, and I have to admit I haven’t really looked into it deeply yet, but it’s definitely worth considering.
Of course, you have to factor that in somewhere, but then I also have to offset the buffer tank for the solar system including the costs of the system. Budgeting a flat 5,000€ is not a bad estimate, I think.
So that would mean an initial investment saving of around 3,500 to 4,000€.
The footprint will likely be smaller rather than larger, since such a buffer tank is not exactly small.
Work?
Maintenance is required for every heating system.
If I assume consumption costs of 200€/year for domestic hot water heating, which the solar system can never cover 100%, it still takes 15 to 20 years before I break even on the savings. Probably closer to 20, since the solar system produces nothing in winter and little in autumn and spring.
Of course, it’s not a cure-all, and I have to admit I haven’t really looked into it deeply yet, but it’s definitely worth considering.
Is it really necessary to supplement gas to this extent? I only had a short time to search online and didn’t get any clear answers, as some information might be outdated. However, I got the impression that gas alone barely meets the primary energy demand. But mechanical ventilation with heat recovery (if desired anyway) would still be taken into account. Wouldn’t that be sufficient then?
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