ᐅ Heating system with multiple heating circuits?

Hello and happy New Year!

Since I want to equip my new house entirely with underfloor heating, I am considering the system’s thermal inertia... In other words, I am concerned that the heating system might not warm up the rooms quickly enough in the evenings during transitional seasons.

For this reason, I have thought about installing a heating system with more than one heating circuit and at least laying the supply lines for additional conventional convector radiators in the rooms. This would allow me to upgrade if the underfloor heating system turns out to be insufficient in terms of performance.

Would this be a sensible solution from your point of view?

No.

The heating system must be designed from the start to provide the required heating capacity.

For other reasons, it may be worth discussing whether a combination of underfloor heating and radiators makes sense (although this is rarely the case...).

What exactly do you mean by warm in the evening? Underfloor heating is not usually adjusted frequently; it maintains a constant temperature 24 hours a day because it has a slow response time.

Hello and thank you for your contributions!

Because underfloor heating is inherently slow to react, I am concerned that during transitional periods—when it is still fairly warm during the day but already quite cold at night—it might not adjust quickly enough. For example, the living room could become cold in the evening, and then feel too warm the next day.

Your concerns about the supply temperature would be worth a closer look if you plan to equip an uninsulated villa from the 19th century with underfloor heating.

A new building according to the Energy Saving Ordinance is no longer heated but rather tempered, so the thermal inertia of the underfloor heating no longer plays a role. When properly adjusted, it ensures consistent temperatures throughout the entire heating period.

Theodorius schrieb:
however, at night it already gets uncomfortably cold, and the system can’t adjust quickly enough.

It doesn’t need to adjust, it continues heating. Because the response time, depending on room size and heat losses, can be 1, 2, 3 up to 12 hours before anything actually changes.

You don’t frequently adjust underfloor heating.

Theodorius schrieb:
So it could be that the living room gets cold in the evening and then too warm the next day.

In theory, yes.

Theodorius schrieb:
which has not only one heating circuit but at least the supply lines for additional conventional convector radiators

Economically, the biggest nonsense you can do, at least here in Germany, in well-insulated homes with permanent occupancy.

As an example, here are my temperatures in one of the bedrooms compared to outside and supply temperatures. WITHOUT individual room control. As you can see, nothing changes regardless of what’s happening outside, and the current temperatures can be safely considered as transitional season conditions.