ᐅ New Construction! Help Needed with Heating System!

Created on: 15 Feb 2014 01:15
B
Biago
Hello. I have a question: We want to build a one-and-a-half-story house with a pitched roof using timber frame construction. Now I am looking for the right heating system! We have decided to use a condensing boiler with a storage tank and two solar collectors in combination with a hydronic fireplace. On the ground floor, underfloor heating will be installed throughout, and on the upper floor, radiators will be installed in the two children’s rooms as well as in the bedroom. In the bathroom, I was thinking of a radiator return loop.

Now my question: Has anyone had experience with something like this? If yes, which company/system would you recommend and what should I pay attention to? Or does anyone have suggestions for improvements?

Thanks in advance for the help! Best regards, Artur
F
fragri
17 Feb 2014 16:22
Hello Biago,
I have now spent quite some time looking into a gas condensing boiler combined with solar plus a water-carrying tiled stove.
The system for our new build is now mostly decided.

Make sure that the stove does not overheat the room where it is installed! If you want to make proper use of the water heating system, you need to burn enough wood… in my case, 10–20 kg (22–44 lbs) per day. With that, it is possible to heat the house without additional natural gas. We quickly opted for a tiled stove with an additional secondary heat channel to avoid overheating the room with too much direct radiant heat. The energy is stored in the secondary heat channels for up to 12 hours and released slowly. Only about 10% of the heat (around 1.5 kW) goes directly into the 62 m² (667 ft²) room where it is installed. Such a stove costs about €15,000 and only pays off after roughly 20 years. But personally, I enjoy heating this way, and I find the investment more sensible than, for example, investing in a KNX/EIB smart home system.

I calculated the wood consumption and estimate about 10 SRM over a heating season of 185 days.

Best regards,
Fragi
€uro
17 Feb 2014 18:58
Biago schrieb:
....We decided to go for a condensing boiler with a storage tank and 2 solar collectors, combined with a water-based fireplace! The entire ground floor will have underfloor heating, and in the upper floor, there will be radiators in both children's rooms and the bedroom. In the bathroom, I was thinking of a radiator return loop....
Why this concept?

Best regards
E
ErikErdgas
20 Feb 2014 12:08
Hello Artur,

I also think that the concept here was driven more by desire than by technical or economic considerations. Did you come up with the concept yourself, or was it presented as an offer?

Could you provide a bit more information about the energy standard, the construction details, and the energy consumption? I would also avoid having two different heat distribution methods, just as I would avoid multiple heat generation systems.

The information from fragri about the hydronic fireplace and the risk of overheating is important because it determines future usability: if the stove releases too much heat into the room, you might end up using it less, which means it would not effectively support domestic hot water production.

Best regards, Erik
€uro
20 Feb 2014 12:14
ErikErdgas schrieb:
...Regards, Erik from modern heating
New username for global, generic natural gas sales?

Best regards
B
Biago
20 Feb 2014 18:49
Hello. First of all, thank you for the many responses! Unfortunately, I am a layperson when it comes to energy consumption and energy standards... The reason I chose this heating option was a suggestion from a colleague who used to work in heating systems. He said that if you use a gas condensing boiler combined with two solar collectors, it can heat the domestic hot water! Adding two more solar collectors to also heat the heating water, together with a buffer tank and a water-based fireplace, could further heat without using gas, especially during winter.

To revisit the topic, we are building a detached house with a timber frame construction of about 140 sqm (1500 sq ft) and I would like to have underfloor heating. Now the question is: what type of heating system should we install?

On one hand, I want to save some money, but on the other hand, I want something efficient! I know these are somewhat contradictory goals, but there must be a way or possibility to achieve both!?

Also, I want to mention the reasoning behind it: underfloor heating on the ground floor and upstairs bathroom only, while the remaining rooms upstairs (3 bedrooms) would have radiators. This way, if I want to warm up the bedrooms quickly for a short time, I can just turn on the radiators and that’s it! Underfloor heating takes longer to warm up and stays warm for longer, which is sometimes not desired. For the rest of the times when I need heat without turning on the underfloor heating, I could just use the fireplace.

Well, I’ve been dealing with this for weeks now and still don’t know which type of heating system I should decide on. Some have already recommended only an air-to-water heat pump, but the information on the internet regarding the consumption of such a system varies widely—from around 2500 kWh per year to about 6000 kWh per year.
Y
ypg
20 Feb 2014 20:02
You need separate heating circuits for underfloor heating and for individual radiators, so two in total -> cost.

Also, it is probably inefficient to let rooms cool down and then turn the radiator up to full power occasionally. This can cause mold problems. It also consumes more energy than continuous heating through underfloor heating.

Caution, this is acquired layman knowledge – please correct me if I am wrong.