ᐅ Sizing of Air-to-Water Heat Pumps for New Construction

I think it looks quite good; the circuits are fairly balanced.

You could consider whether to include the shower with underfloor heating in the guest bathroom, and possibly have 5 circuits of 80 meters (260 feet) each in the living area.

Has the connection of the heating control valve also been calculated by the office? Its diameter must not be too small.

Try to arrange with the heating installer to lay the loops in one continuous length without pressing the pipes together.

He may ask for a higher price, but you will avoid joints that cause pressure loss and potential weak points.

The hallway will be warmer than the bathroom. You can spread out all the pipes running through there a bit and omit your own circuit.

Lumpi_LE schrieb:

The hallway will be warmer than the bathroom. You can spread out all the pipes running through there a bit and omit the dedicated loop.

I used to think the same, and normally there wouldn’t be a heating loop planned in the upstairs hallway since it heats up anyway. However, after reading the relevant threads here about heat pumps, supply temperatures, and cold bathrooms, I’m unsure.

I would have said, sure: all those pipes pass through the hallway and heat it up. But if the hallway has its own heating loop, the pipes running through deliver less energy to their target room. In low-temperature systems, every heated room warms the adjacent unheated spaces as well. In my case, wouldn’t that mean that my upstairs bathroom warms the hallway and then lacks energy to heat itself properly?

So having heating in the hallway might be better than needing it. I can always shut off the flow at the manifold if it really gets too warm, right?

Basement hallway:

Ground floor hallway:

This area also heats the underside of the basement ceiling from the unheated zone and thus the basement hallway and the two basement rooms.

The upstairs hallway looks a bit exaggerated. However, there is also an exhaust vent here from the mechanical ventilation with heat recovery—so the warm air is constantly being extracted.

T_im_Norden schrieb:

Try to arrange with the heating installer to lay the circuits continuously without joining pipes by press fittings.

They might want more money for that, but then you won’t have any transitions causing pressure loss or potential weak points.

First, I want to make sure they even agree to this and stick to the installation spacing and lengths. Then the details can come.

OWLer schrieb:

However, if the hallway has its own heating circuit, the pipes running through it transfer less energy before reaching their target room.

Install it, since you can always completely shut it off later if needed, or set it to 0.2 liters (0.05 gallons).

OWLer schrieb:

Is this a tiled walk-in shower? If so, please also provide the substrate or base details. Maybe you could then create two heating circuits and, to gain length on one circuit, route the return pipe in the hallway. That way, you also increase the average water temperature for the bathroom section and can better balance the pipe lengths. I did the same in my setup.