A lot of theory added again. Unfortunately, no information on how much pump current etc. is saved.
Practical solutions for equipping a small room with a long circuit are still missing.
Just like the often recommended "wall heating," for which the contractor then quickly charges €1000, which quickly calls into question whether all the theory still makes sense in practice?
Since no one knows the design, no one can calculate anything... no arms, no legs, no cookie ;), but since the additional costs approach zero or even become negative, they are irrelevant anyway.
Small rooms can be combined. Since the "adjacent rooms" are supposed to run unregulated anyway, it makes no difference. Flow into the desired warmer room, return into the "cold" one.
If the goal is just to stay cheap, build according to the Energy Saving Ordinance with gas heating.
If you only look at individual parts, you might arrive at questionable results, so I am a fan of overall comparisons:
Omission:
- buffer storage
- second pump group
- thermostats
- RTR
- any actuators
- wiring
Neutral up to 2 hours more effort:
- planning
Additional costs (optional if aiming for efficiency, but neither is mentioned here):
- wall heating
- a few hundred meters more piping
You can add the prices yourself at the end, since there seems to be corresponding knowledge ;)
We will not consider efficiency through flow temperature reduction for simplicity, since that is just gray theory again. The rest are just the simplest side effects with the same resources with cost savings through less material.
The thread starter is aware that he has to take whatever is offered anyway, so this is purely a theoretical exercise...
Final note: Ask how many electricity meters are supposed to be installed. The second meter often isn’t worth it in a single-family house due to the additional basic fees.