S
spacecowboy.2123 Nov 2009 16:14Hello,
this is my first post in this forum... Hello everyone.
My partner and I have just started building a house. The construction is being done by a contractor, except for the electrical work, which I am doing myself.
I have a few questions.
We insulated the foundation slab with 10 cm (4 inches) of insulation. The exterior walls will be insulated with cavity insulation from Rockwool: one 60 mm (2.4 inches) board and another 80 mm (3 inches) board staggered on top. The roof will be insulated with 240 mm (9.5 inches). The windows are triple-glazed with a U-value of 0.8.
We will have a standard gas heating system installed, with radiators in the rooms.
Now, according to the new regulations, we have to use renewable energy. We have looked into the Vaillant auro VSC 196 20 and think Vaillant is very good. The system includes a 150-liter (40-gallon) stratified storage tank for two solar collectors that come in a set.
Our house is 120 m² (1,292 ft²) and two people will live in it.
My questions are:
Is this heating system with the solar collectors sufficient?
Do I need a residential ventilation system with the type of insulation we have?
If yes, can I pre-install the ductwork now and add the rest later?
Budget is, of course, an important factor.
I would appreciate any advice.
Best regards,
Stefan
this is my first post in this forum... Hello everyone.
My partner and I have just started building a house. The construction is being done by a contractor, except for the electrical work, which I am doing myself.
I have a few questions.
We insulated the foundation slab with 10 cm (4 inches) of insulation. The exterior walls will be insulated with cavity insulation from Rockwool: one 60 mm (2.4 inches) board and another 80 mm (3 inches) board staggered on top. The roof will be insulated with 240 mm (9.5 inches). The windows are triple-glazed with a U-value of 0.8.
We will have a standard gas heating system installed, with radiators in the rooms.
Now, according to the new regulations, we have to use renewable energy. We have looked into the Vaillant auro VSC 196 20 and think Vaillant is very good. The system includes a 150-liter (40-gallon) stratified storage tank for two solar collectors that come in a set.
Our house is 120 m² (1,292 ft²) and two people will live in it.
My questions are:
Is this heating system with the solar collectors sufficient?
Do I need a residential ventilation system with the type of insulation we have?
If yes, can I pre-install the ductwork now and add the rest later?
Budget is, of course, an important factor.
I would appreciate any advice.
Best regards,
Stefan
6
6Richtige23 Nov 2009 23:47Hello Stefan,
what is the heating system expected to cover?
A controlled ventilation system with heat recovery is advisable. The necessary flat ducts and outlets should be installed by a professional company.
Whether solar systems are worthwhile is a matter of debate.
What does the energy performance certificate prepared by your builder say? Who is designing the heating technology for your construction?
what is the heating system expected to cover?
A controlled ventilation system with heat recovery is advisable. The necessary flat ducts and outlets should be installed by a professional company.
Whether solar systems are worthwhile is a matter of debate.
What does the energy performance certificate prepared by your builder say? Who is designing the heating technology for your construction?
Hello,
first of all, I would go for underfloor heating, no matter what type of heating system.
The main thing is to have low supply temperatures from the start.
That way, if gas becomes too expensive, you can switch to a different heating system.
Collectors and heating is a separate topic. But it doesn’t help much.
Here, I can only agree with 6Richtige.
Best regards
first of all, I would go for underfloor heating, no matter what type of heating system.
The main thing is to have low supply temperatures from the start.
That way, if gas becomes too expensive, you can switch to a different heating system.
Collectors and heating is a separate topic. But it doesn’t help much.
Here, I can only agree with 6Richtige.
Best regards
S
spacecowboy.2124 Nov 2009 19:29Hello,
So you think I should have the pipes installed by a professional. Why? Is it that difficult? I’ve been looking at a system from Maico….
Yes, solar energy is debatable, especially here in northern Germany. But I have to use renewable energy…… 😕 That’s why I was asking if the heating system with two collectors is sufficient.
We received from the building supervisor a "Certificate of energy-saving thermal insulation and energy-efficient technical systems in buildings according to the Energy Saving Ordinance 2009." It’s 10 pages long…… and I can’t make much sense of it.
We have also considered underfloor heating in our thoughts. The heating system, in general, is a problem. There is no real plan, and the heating technician (supervisor) really doesn’t know much… poor to no advice… So, a 60-year-old East Frisian who isn’t open to anything new.
It’s very difficult here in the countryside.
I am grateful for any tips.
Best regards
Stefan
So you think I should have the pipes installed by a professional. Why? Is it that difficult? I’ve been looking at a system from Maico….
Yes, solar energy is debatable, especially here in northern Germany. But I have to use renewable energy…… 😕 That’s why I was asking if the heating system with two collectors is sufficient.
We received from the building supervisor a "Certificate of energy-saving thermal insulation and energy-efficient technical systems in buildings according to the Energy Saving Ordinance 2009." It’s 10 pages long…… and I can’t make much sense of it.
We have also considered underfloor heating in our thoughts. The heating system, in general, is a problem. There is no real plan, and the heating technician (supervisor) really doesn’t know much… poor to no advice… So, a 60-year-old East Frisian who isn’t open to anything new.
It’s very difficult here in the countryside.
I am grateful for any tips.
Best regards
Stefan
Hello,
here is how I see it: You can get the two collectors to comply with the 2009 Energy Saving Ordinance.
Although, given your house description, that already surprises me.
Why even the 2009 Energy Saving Ordinance if you are building now? Don’t you already have approval under the 2007 Energy Saving Ordinance?
Isn’t this a KfW 70-2007 house with a favorable KfW loan?
Wouldn’t it make more sense to go for underfloor heating combined with a ducted heat pump and claim the BAFA subsidy?
(Without collectors — so you would rather invest the money and the subsidy in the heating system. That way you are independent from gas, don’t need a chimney, and avoid gas standby fees.)
The high flow temperature required by radiators doesn’t help with renewable energy systems. Even with a stratified thermal storage tank, the collectors will cool down the tank in winter. This can even result in a net loss.
Best regards
here is how I see it: You can get the two collectors to comply with the 2009 Energy Saving Ordinance.
Although, given your house description, that already surprises me.
Why even the 2009 Energy Saving Ordinance if you are building now? Don’t you already have approval under the 2007 Energy Saving Ordinance?
Isn’t this a KfW 70-2007 house with a favorable KfW loan?
Wouldn’t it make more sense to go for underfloor heating combined with a ducted heat pump and claim the BAFA subsidy?
(Without collectors — so you would rather invest the money and the subsidy in the heating system. That way you are independent from gas, don’t need a chimney, and avoid gas standby fees.)
The high flow temperature required by radiators doesn’t help with renewable energy systems. Even with a stratified thermal storage tank, the collectors will cool down the tank in winter. This can even result in a net loss.
Best regards
Hello,
I guess most of these great suggestions will fail due to cost. A gas condensing boiler with a basic solar system is simply the cheapest investment option. Unfortunately, with these standard houses (sorry) it’s common that the general contractor (GC) just pulls a plan out of thin air and says this is the cheap option. Everything else would have to be carefully calculated, which the GC and probably your installer are not able to do.
I would probably stick to the 2009 Energy Saving Ordinance standard—why build worse now?
Controlled residential ventilation should definitely be included. You can install the ducts yourself if you know what you’re doing 😀
I would definitely install underfloor heating. If you really want radiators, there are also heat pump radiators that operate at a similar temperature range as underfloor heating. But that’s really more for renovation projects.
Now, about heat generation:
For a small budget, a condensing boiler with a solar system.
For a moderate budget, an air-to-water heat pump with a solar system—but you absolutely need to do the proper calculations, don’t just buy one.
For a large budget, a ground source heat pump with solar systems and building element activation. Thermal storage uses ceilings, walls, and foundations; in extreme cases, ground collectors are needed.
It’s also nice that these systems can provide cooling in summer. Consolar offers an alternative using an ice storage system as a long-term storage for solar heat. The high-end option is hybrid solar collectors, which produce electricity and heat simultaneously.
After that, you can sit back on the terrace and give the gas and electricity suppliers the finger—though your wallet will be several thousand euros lighter.
I guess most of these great suggestions will fail due to cost. A gas condensing boiler with a basic solar system is simply the cheapest investment option. Unfortunately, with these standard houses (sorry) it’s common that the general contractor (GC) just pulls a plan out of thin air and says this is the cheap option. Everything else would have to be carefully calculated, which the GC and probably your installer are not able to do.
I would probably stick to the 2009 Energy Saving Ordinance standard—why build worse now?
Controlled residential ventilation should definitely be included. You can install the ducts yourself if you know what you’re doing 😀
I would definitely install underfloor heating. If you really want radiators, there are also heat pump radiators that operate at a similar temperature range as underfloor heating. But that’s really more for renovation projects.
Now, about heat generation:
For a small budget, a condensing boiler with a solar system.
For a moderate budget, an air-to-water heat pump with a solar system—but you absolutely need to do the proper calculations, don’t just buy one.
For a large budget, a ground source heat pump with solar systems and building element activation. Thermal storage uses ceilings, walls, and foundations; in extreme cases, ground collectors are needed.
It’s also nice that these systems can provide cooling in summer. Consolar offers an alternative using an ice storage system as a long-term storage for solar heat. The high-end option is hybrid solar collectors, which produce electricity and heat simultaneously.
After that, you can sit back on the terrace and give the gas and electricity suppliers the finger—though your wallet will be several thousand euros lighter.
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