Heating system for our single-family house!

  • Erstellt am 2019-02-26 10:10:35

Bauherrin92

2019-02-26 10:10:35
  • #1
Hello everyone,
We are going to build a townhouse with 160 sqm + basement ( ). We are two adults, a 6-year-old daughter, and a baby on the way. We all like to take long warm baths or showers.

Our construction contract includes two possible heating systems in the price. I don’t want to start a fundamental discussion here about whether air-water heat pumps or gas/solar are better. Maybe someone has an idea and can give us tips on what would be more suitable for OUR building project and OUR family situation. Also, I have some specific questions...

(P.s.: Underfloor heating will be installed throughout the house, except the technical room. We also want a fireplace)

1. Gas condensing boiler with hot water storage (company Wolf, 4-8 KW, with 300 l storage water volume). Domestic hot water supply is central without circulation lines. 2-3 flat plate solar collectors included.

- Is 300 l enough for us "warm showerers" or will we run out of hot water by the end of the day?
- What is meant by circulation lines?
- Are 2-3 flat plate solar collectors enough? Our acquaintances are also four and have 12

OR:

2. Air-water heat pump (company Rotex HPSU Compact, 4-8 KW). With outdoor and indoor unit. 1 energy storage tank with 300 l storage water volume.

- Does anyone have experience with the device regarding noise?
- I once read that a photovoltaic system should also be installed with an air-water heat pump, but that is quite expensive, right?

Since we want a fireplace, the idea came up to combine a water-bearing fireplace stove with gas/solar and install a combined storage tank (or stratified storage tank?). What would that cost extra? Does anyone have experience with that?

What would you recommend to us? Thanks in advance!
 

Obstlerbaum

2019-02-26 10:41:12
  • #2

The storage tank is more than sufficient if you set it high enough. At a sample temperature of 70°C, you would have to mix in quite a bit of cold water before you can shower comfortably. If you only go up to 40°C, it comes almost directly from the shower. However, in my opinion, high storage temperatures are uneconomical. If you plan your house just around a steaming full bathtub, go with gas.

Circulation lines can be omitted in a single-family house; then it just takes 5 instead of 2 seconds for hot water to come out of the tap. One less thing that can break.

With solar thermal, I would only install what is absolutely legally required; it is not very economical. Your acquaintances with 12 panels probably need a 1000 l storage tank to absorb the heat generated in midsummer.

Photovoltaics is a general topic and not to be seen directly in connection with the air-to-water heat pump. The air-to-water heat pump switches on sometime early in the morning, when typically no sunbeam falls on your roof yet. In the case of a city villa, the roof pitch is quite low, and mounting panels on stands looks, in my opinion, rather poor.
 

Bauherrin92

2019-02-26 10:56:30
  • #3


Thanks for the clarification!



That's exactly right :) 12 panels and a 1000l storage tank, which is why our 300l seemed so small to me.



We can choose between 22° and 24°; based on your statement, we should rather take 24°?
 

Obstlerbaum

2019-02-26 11:11:54
  • #4

24° would be better, but with your roof shape you wouldn't have that much space facing south anyway. Using all three surfaces will be expensive again, because most inverters only have inputs for two strings (modules connected in series). If you don't want to splash out 10-15k straight away, you can provide a 50mm empty conduit for later retrofitting. Accordingly, also take a slightly larger electrical cabinet right away.
 

Bauherrin92

2019-02-26 11:42:46
  • #5


Oh dear, I realize once again I have no idea about the topic..inverters, strings...all new terms for me :D :D

In general, we tend more towards gas/solar, simply because gas is tried and tested, I don't know anyone who has an air-to-water heat pump. I am also worried about the electricity costs...
 

Lumpi_LE

2019-02-26 12:15:09
  • #6
If you have no knowledge of the technology and want to avoid dealing with it as much as possible, and also have a high hot water consumption, you should choose gas. Collectors as little as possible, because they are completely uneconomical and are only installed so that you can comply with the energy saving ordinance with gas.

Air-water heat pump + photovoltaic I generally find better - but you should deal with the planning and be able to adjust the pump later and understand what you are doing.
 

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