ᐅ Heating: Partial Knowledge, Conflicting Advice, Uncertainty
Created on: 14 Nov 2017 20:32
C
cybergnom
Hello everyone,
We will start building our single-family house (220 sqm (2,370 sq ft) living area plus basement) at the beginning of 2018.
Basically, we do not prioritize any KfW standards. Initially, we planned to install a gas boiler (gas connection already included in the land price) with solar thermal and a tiled stove with a water jacket in the living room.
A week ago, we had an appointment with a heating engineer. He told us that this setup would not comply with certain building regulations (energy saving ordinance? 30% renewable energy requirement?). He said that we would either have to use a heat pump or pellet heating system or, in addition to the above configuration, install a central ventilation system.
Following this, we researched the topic and were leaning toward a “heat pump + photovoltaics” solution.
Today, another heating engineer came by. He said that gas with solar thermal is no problem if properly designed and recommends it to any homeowner with an existing gas connection.
So, what is actually correct? What is really advisable?
We will start building our single-family house (220 sqm (2,370 sq ft) living area plus basement) at the beginning of 2018.
Basically, we do not prioritize any KfW standards. Initially, we planned to install a gas boiler (gas connection already included in the land price) with solar thermal and a tiled stove with a water jacket in the living room.
A week ago, we had an appointment with a heating engineer. He told us that this setup would not comply with certain building regulations (energy saving ordinance? 30% renewable energy requirement?). He said that we would either have to use a heat pump or pellet heating system or, in addition to the above configuration, install a central ventilation system.
Following this, we researched the topic and were leaning toward a “heat pump + photovoltaics” solution.
Today, another heating engineer came by. He said that gas with solar thermal is no problem if properly designed and recommends it to any homeowner with an existing gas connection.
So, what is actually correct? What is really advisable?
There are many ways to achieve this... but you cannot bypass the energy savings regulation even if you are not interested in the KfW program.
In most cases, gas plus solar thermal is sufficient (unless the house has very poor performance), but this does not mean that a typical small solar system will eventually pay off...
However, this is the biggest nonsense:
I would save the few thousand extra costs and invest them instead in part of the solar thermal system. Or better yet, as others have already mentioned, install a controlled mechanical ventilation system with heat recovery right away.
In most cases, gas plus solar thermal is sufficient (unless the house has very poor performance), but this does not mean that a typical small solar system will eventually pay off...
However, this is the biggest nonsense:
cybergnom schrieb:
with a water buffer in the living room.
I would save the few thousand extra costs and invest them instead in part of the solar thermal system. Or better yet, as others have already mentioned, install a controlled mechanical ventilation system with heat recovery right away.
Mycraft schrieb:
You can’t avoid the Energy Saving Ordinance even if you’re not interested in KfW support..Well, even though this wasn’t the main point of the question... I’m still not 100% convinced by that statement. Even though we’ve already discussed it extensively here (see below)...
https://www.hausbau-forum.de/threads/wie-kann-man-die-Energieeinsparverordnung-umgehen-und-den-Behördenwahnsinn-vermeiden.24869/page-6#post-212307
Because it is a FACT that several homebuilders have been exempted from the Energy Saving Ordinance.
I even think I’ve seen an official application somewhere for exemption from the Energy Saving Ordinance called “Application for exemption from the requirements of the Energy Saving Ordinance.”
Of course, with this application you have to prove that the costs for the “required technology” in a 10-year calculation exceed those of a “commonly used method” (i.e., without major renewable energy systems, etc.). Then you would be exempt from the Energy Saving Ordinance requirements.
The much-cited Mr. Fischer has a lot to say on this topic... Just google “Herr Fischer on Energy Saving Ordinance exemption.”
Whether this makes sense for you or not, I don’t want or can’t judge here..
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