Spontaneous improvements to underfloor heating design

oh right. I overlooked the stub at the HKV.

I find the long pipes in the rooms on the upper floor unfortunate, as they are used to heat the hallway...
Unnecessary heat loss, especially for the bathroom!

With us, the plumbing company came up with the idea themselves to optimize the installation plan originally proposed by a planning company.

The planning company also did not want to lay pipes in the ground floor hallway, but then the plumbing company optimized two rows a bit and laid them through the hallway after all.

I have 18 heating circuits for 128 sqm of living space. All rooms upstairs have 2 circuits, the bathroom also 2, kitchen 2, hallway 1, utility room 1, guest WC 1, and living room 4 circuits.

They installed and connected everything with 28mm stainless steel pipes (the two heating circuit distributors). They also said on their own initiative that they maintain a 10 cm installation spacing because of the heat pump. With gas, they would have increased the spacing.

Very commendable, your plumbers.

at least in 28mm copper pipe and no 20mm or 25mm PE or aluminum composite pipe nonsense

everything installed and connected with 28mm stainless steel pipe

What is the advantage of stainless steel or copper compared to PE? Or is it just about the diameter?

Is it not a problem that the pressure loss increases in the circuit with a longer bath circuit, which already has the highest pressure loss upstairs?

Regarding the AZ and WZ, I’m not so sure anymore if that is wise.
The AZ is not used daily and not permanently forever. The WZ, on the other hand, should always be nice and warm.
Should I really take away the possibility to control both separately here?

Also, there is a wood stove in the WZ. Therefore, I’m simply assuming that the underfloor heating in the WZ runs at a rather low load in winter.

I’m undecided.

Just ask what extra charge he wants for requesting a larger distributor with 2 time circuits for the living room. Combining rooms is possible, but not like that. We connected the guest WC with 3m² to the anteroom, that’s doable, but I would always make living spaces individually controllable.

larger distributor with 2 timers for the living room

Distributors are already in place and live, heat pump is already running on standby. I think the train has left the station. But then I'd rather just stick to the bathtub.