New construction - floor heating unevenly hot (Vaillant aurocompact)

Hello,

so I had the same problem once, it was in a rental apartment and each apartment had its own boiler and distribution box. The room temperature in our place was constantly about 21 degrees, which was completely sufficient for us. If you wanted it warmer on very cold days, that didn’t work for us either. I turned up the thermostats, changed the flow temperature, etc... Since it was a rental apartment, no one really cared how the heating was set. The main thing was no complaints and everyone pays their utility costs. Those turned out to be very high afterward because no one properly adjusted the heating.

But since it is your house, if I were you, I would have a heating technician come who calculates the flow temperatures based on room size, checks whether the heating circuits are correctly connected to the distributor, and I would also have a little explanation myself on how to set the temperatures without risking excessive consumption or too high flow temperatures (which can damage the material).

The room temperature actually feels almost equally warm in all rooms according to our perception, only the floor deviates significantly from the warmth, but also consistently in the same rooms.

In the picture with the heating circuit distributor, you can see that all flow indicators are at the very top, i.e. no flow.
Maybe the photo was taken exactly at the moment when all valves were closed or there is also an error here. Possibly control valves NC and NO confused.

The photo was taken yesterday around 6 p.m. Nothing was changed, newly adjusted, or otherwise altered beforehand. I only opened the protective flap to photograph the heating distributor.
The flow indicators are the ones with the red caps, right? What would I need to change?

PS: Thanks for all the answers, which I consider very helpful!

Good if all rooms are warm enough for you, the basic requirement is first secured.

Now you can check if the system is also running effectively.

I assume the bathrooms have the warmest floor?

For the time being, we need information from you:
- What heating load was calculated for the house.
- How many heating circuits do you have (the number of connections in the heating circuit distributors).
- What flow do the parts with the red caps show when the heating is running.
- How long are the individual circuits.
- What supply temperatures and return temperatures do you have when the heating is running.
- What measured temperatures do you have in the rooms.
- Are the Err (the temperature regulators in the rooms) all on, or are some set to off or 0.

That the floors are different temperatures is normal for now.

Hello,

I have checked the documents to provide more data for the evaluation. A hydraulic balancing was carried out, I quote:

„Expansion vessel checked: yes, fill pressure 1.5 bar



Calculation of the heating circuit setting (underfloor heating):

Design flow temperature: 43°C

Heating circuit return temperature: 32.4°C

Determined total flow rate: 7.08 l/h

Total heat load: 6983 watts

Underfloor heating output: 6977 watts

Total water quantity: 708.2 kg/h

Max. pressure loss: 17200 Pa

Total heating surface underfloor heating: 122.3 m2

Total room area: 132.8 m2

Pump delivery height (at total flow): 1.06 m

Flow controller/branch control valve (single-pipe heating): present



TKM surface heating system according to DIN EN 1264, design:

Distributor 1: Tacker system cement screed over pipe: 45mm, 1.2 W/mK

Hall, kitchen, living, WC, utility room, dining room => all on ground floor

7 heating circuits, water quantity 337.6 kg/h PE-RT heating pipe 17x2



Distributor 2: Tracker system

Hallway (supply lines), bedroom, children’s room 1, children’s room 2, bathroom

4 heating circuits, water quantity 370.7 kg/h



Energy certificate:

Final energy demand: 52.5 kWh

Primary energy demand: 58 kWh

Total fulfillment of the Renewable Energy Heat Act: 130% fulfillment rate



System evaluation according to DIN 4701-10

-Heating: Central heat generation, condensing combination boiler 15 kW, natural gas E, boiler efficiency at full load: 98%, Vaillant VSC S/D 146/4-5 190; two flat solar collectors for hot water preparation

Distribution: design temperatures: 35/28°C

Individual room control with two-point controller 0.5 K switching differential

no circulating pump present

Heat demand: 7165 kWh/a (Primary energy: 7371 kWh/a)


-Hot water: Apartment central hot water preparation, 2 heat generators (Heat generator 1 68% coverage share solar system Sonnen-Energie Vaillant auroTHERM VFK 145 V; Heat generator 2 32% coverage share hot water generation via the heating system

Storage: bivalent solar storage tank 270 l"



These are all the data I could find in the construction folder.


The ERR (which occasionally make a „clicking noise“) will be set to „6“ (maximum) in all rooms around Monday, because we will have very warm weather in Brandenburg in the next few days.


The measurement with the thermometer in the individual rooms will also take place in the next days

The information is somewhat contradictory, while the energy certificate

Auslegungstemperaturen: 35/28°C

indicates, the setting for the heating circuit

43/32

is given.

Why do you want to set the Err to 6 when it gets warm?

At the moment, you can't do much regarding the thermal balancing because it is already too warm and there are too many solar gains.

Please also read off the flow temperature at the gas boiler during operation.