Heating screed - heat pump or mobile heating device?

Hello everyone,

I have a question again because we are currently facing a problem and the experts are not entirely in agreement.

We have covered about 170 m2 of area with underfloor heating and next week the screed will be installed. According to the screed installer, heating can be started after about 7 days.

Our air heat pump (9 KWh capacity) with outdoor installation would be operational by then and until now we also thought that it could be used for heating up. Now we have been told that the heat pump cannot manage this at these outdoor temperatures and that we cannot use it. Instead, we are now supposed to rent a mobile heating device (e.g. Hotboy), which heats and dries the underfloor heating with electricity. However, another heating engineer was surprised and said that it should work with the heat pump...

Is that really necessary? And why is our heat pump supposedly not able to do it?
How was it with you?

Of course the heat pump should manage that, if necessary with the heating element. It was done the same way for us, the (ground) heat pump was not fully operational yet, but the heating element was. The electricity meter does start to spin, but with the separate device it probably wouldn’t be any different.

Thank you for the quick response! The electricity meter certainly spins in both variants... With the mobile heater, also the wallet, because of the rent and the effort to connect it. Did you have the screed laid in autumn as well?

thank you for the quick response! The electricity meter certainly spins in both cases... With the mobile heater also the wallet, because of the rent and the effort to connect it.

Did you also have the screed laid in autumn?

For us, the screed was laid in spring - we only had the topping-out ceremony on St. Nicholas Day.

Hello,

we received our screed in November 2014 and dried it by heating alone with the air-water heat pump.

We had outside temperatures between -10° and +5° during the drying heating phase – we still only used the heating rod for about an hour immediately after starting the heating system.

That was the 4th day in a row with -10° and the house had cooled down accordingly. The rest of the drying heating was easily managed by the air-water heat pump without heating rod support.

Regards,

Dirk

Thank you Doc.Schnaggls, then it would be roughly like with us.... We will call the customer service of our heating system again today and ask directly how it is now... Let's see how we will do it in the end.