Costs for plumbing & heat pump

Hello everyone,

attached is the offer for plumbing.

Attached is the offer for the heat pump.
Also the factory plans.

The bathroom upstairs will still be changed a bit. The middle wall of the T-piece is moved further up.
This makes the shower bigger. The bathtub will be placed to the left of the T-piece.
The washbasin will then be placed on the left side. Where the bathtub is currently shown on the plan.

Underfloor heating will be installed in every room except the utility room and the two rear rooms in the basement.

Tiling and ventilation will be done by another trade.
Dry construction as well.

A few notes on what is not optimal with heat pumps:

[*
Buffer tank
[*]Circulation
[*]Radiators, also in the bathroom: 1. brings nothing, 2. oxidation. Alternatively:
[LIST]
[*]Underfloor heating additionally in the wall and/or ceiling in the bathroom or
[*]Electric radiator to heat the bathroom only briefly but promptly


[*]Individual room control (remove or deactivate afterwards/do not install thermostats)

Each single one – I would call it a planning error – costs you efficiency permanently and thus electricity during operation.

What I would definitely catch up on if not already done: have surface heating planned in detail according to the room-specific heating load and specify your room temperatures instead of temperatures according to DIN.

I would also install underfloor heating in the utility room, otherwise you heat the room indirectly via the other rooms and waste important heating surface. The utility room circuit could be partially placed in the cloakroom/hallway. The same applies to the guest bathroom, so you do not have mini-circuits. In the guest bathroom, of course, the warm side goes into the bathroom with close spacing and the cold side into a part of the hallway.

When heating up the screed, I would make sure not to go higher than the maximum calculated flow temperature (approx. 30°).

I see the utility room as unproblematic, especially if the heating is already located there. For me, the room is the warmest due to heat loss from the hot water tank, the piping, and the connection of the underfloor heating.

Depends. Yes, there are probably more critical spots here. The utility room has little exterior wall but may also heat the stairwell. Our utility room is slightly cooler than other rooms due to a lightly running underfloor heating, despite the heating hydraulics and storage in the room.

A room-by-room heating load calculation can provide insight.

A few remarks about what is not optimal with heat pumps:

[*
Buffer storage [*]Circulation [*]Radiators, also in the bathroom: 1. is useless, 2. oxidation. Alternatively: [LIST] [*]Underfloor heating additionally in the wall and/or ceiling in the bathroom or [*]Electric radiators to heat the bathroom only briefly but quickly
[*]Individual room control (remove or deactivate afterwards/do not install thermostats)

Each single one – I call it a planning error – permanently costs you efficiency and thus electricity during operation. What I would definitely catch up on if not available: Have surface heating planned in detail according to the heating load per room and specify your room temperatures instead of temperatures according to DIN. I would also equip the utility room with underfloor heating; otherwise, you heat the room indirectly via the other rooms and waste important heating area. The utility room circuit could partly be laid in the cloakroom/hallway. The same applies to the guest bathroom, so you don’t have mini circuits. In the guest bathroom, of course, the warm side in the bathroom with close spacing and the cold side in part of the hallway. When heating up the screed, I would make sure not to exceed the maximum calculated flow temperature (approx. 30°).

I find it wrong to call circulation a planning error. It is comfort and costs money. I also think individual room controllers fall under that. I agree with the rest.