Ventilation of toilet and bathroom radiator completely electric

Hello everyone,

today the sanitary installers were here for the first time and I would like to coordinate with you:

1. Ventilation pipe for guest WC
The plan foresees a ventilation pipe for the guest WC on the ground floor via drywall through the upper floor up to the roof. I never liked that because then we have such a boxed-in wall upstairs. Now the installers offered that it can also be vented in the pre-wall element via a valve. I thought that was great but is that also okay? Are there any disadvantages because of that?

2. Towel radiator (TR) with underfloor heating powered by a ground source heat pump
We had already dealt with this, but today the two colleagues unsettled me when they asked where the TR should go so that it can be connected to the underfloor heating. I then said that it is heated purely electrically and filled with glycol. So no connection to the underfloor heating. They were very surprised. But we decided against it because it is pointless to fill the TR with the 23° "lukewarm" water, which we wouldn’t even notice since body temperature at 36° would be warmer anyway. Is it still reasonable to include the TR in the system? If yes, why would that be?

Best regards and thanks in advance.
Redsonic

But we decided against it because it is pointless to fill the radiator with the 23° "lukewarm" water, which we wouldn’t even notice since even the body temperature at 36° would be warmer. Is it still sensible to include the radiator in the system? If yes, why would that be?

1) Letting towels come into contact with a radiator at 23°C is better than just hanging them on a cold bar. A radiator doesn’t have to feel warm to have such an effect.
2) Towels dry easily on cold bars as well – before the era of towel radiators, we also successfully showered and dried off ;-)
3) If it’s about pre-warmed towels, you can either use a second heating circuit with a higher supply temperature (uneconomical) or use an electric radiator with a heating element. The latter can also be timed.

Ok, thanks already. Maybe a stupid question: Wouldn't connecting to the HKV also heat the underfloor heating with the electric heating cartridge and lose energy to other areas in the house that should actually be for the BHK?

Ok thanks already. Maybe a stupid question: Wouldn't connecting to the HKV also heat the underfloor heating with the electric heating cartridge and lose energy to other areas in the house that should actually be for the BHK?

You are right. A bathroom radiator in the circuit really makes little sense. If the heating installer is concerned that the performance of the underfloor heating is not sufficient, he should 1. also lay pipes under the bathtub and the shower and if that is not enough 2. install a wall heating. Then you can completely skip the bathroom radiator and dry the towels with a towel rail on the wall with wall heating.

Ok thanks already. Maybe a stupid question: Wouldn't connecting to the HKV also heat the underfloor heating with the electric heating cartridge and lose energy to other areas in the house that should actually be for the BHK?

The towel radiator with electric heating cartridge is not connected to the underfloor heating. It is a closed unit with a plug.

1. No disadvantages due to venting directly at the pipe

2. Either wall heating with the underfloor heating pipes or electric cartridge...