Central room temperature controller for ERR underfloor heating

Say goodbye to the idea that the heat pump heats individual rooms.

Imagine your entire house with the rooms as one large water circuit.

Each room has an adjustable access point that determines how much water flows through it in a given time.

The entire circuit is heated to one temperature.

To bring a room to the desired temperature, you must let a certain amount of water flow in depending on the size of the room.

If all rooms are the same size, that is no problem; you simply let the same amount of water in everywhere.

However, rooms are always different sizes, so you have to let in the amount that matches each room.

You regulate this through the access (distributor box of the underfloor heating, here you can set the flow rate).

Unfortunately, in some rooms not enough water can fit in to warm them to the desired temperature (usually the bathrooms since they are small and higher temperatures are desired).

Now you can either create space for more water (smaller pipe spacing or wall heating) or increase the temperature of the water.

Increasing the temperature (this is the known flow temperature) does bring the desired heat into the bathroom, but the other rooms also become warmer.

So you have to reduce the amount of water here until you reach your desired temperature.

This whole process is called hydraulic balancing.

Now there is the problem that at low outside temperatures the heat is no longer sufficient.

You could now increase the amount going into each room, but then you would have the problem that you would have to adjust everything again exactly so that it fits and you would be limited by the smaller rooms where no more water can flow in.

But our heating system knows from the outdoor sensor that the temperature outside is falling.

So it increases the flow temperature to compensate.

Since all rooms were previously adjusted to their right temperature during the hydraulic balancing, this works.

This is the heating curve of the heating system; it contains the information on how much the flow temperature must be changed when the outside temperature changes.

This is now a simplified representation, but it depicts the basic function.

Who does the hydraulic balancing if I consider the installer incompetent (at least for these things)?
When should it be done? After the first heating period?

You do that yourself -> thermal balancing.
Carry it out in winter under overcast skies.
It usually takes 2-3 years until it fits.

Respect!!! Finally explained well!!

ok great! Thank you
And the outside temperature at which the heat pump starts heating should be between 10-13°C in new buildings?

And the outside temperature at which the heat pump starts heating should be between 10-13°C in new buildings?

It depends on the house. No general statements can be made here.

Only you can decide that for yourself. Try it out, if you get cold because the heating doesn't turn on, set it higher.