ᐅ Maximum supply temperature of 27°C for glued vinyl flooring

Hello forum,

We want to install a vinyl floor approximately 2.5 mm (0.1 inches) thick (Joka Designfloor 555 XXL) glued down in our new build with underfloor heating and a heat pump.

The product datasheet states (as with many similar vinyl floors) that the maximum flow temperature of the underfloor heating should not exceed 27°C (81°F). I find that quite cool. Will the floor still feel warm enough to walk on barefoot?

We like it quite warm (in winter, preferably around 23 to 23.5°C (73 to 74°F)). How high would the flow temperature of the heating need to be set for that, or is it even possible to achieve with a 27°C (81°F) flow temperature?

Alternatively, which other (vinyl) floor coverings would you recommend that can handle higher flow temperatures? There are still houses with older underfloor heating systems that run hotter than 27°C (81°F).

Thanks in advance for your collective expertise!

You are confusing two different things. The floor should not get warmer than 27 degrees Celsius (81°F), which is different from the supply temperature of the heating system.

What happens if the sun beats down on it at 35°C (95°F) in summer?

I don’t know, it never gets that warm here.

During the first winter, we never had a supply water temperature higher than 25-26°C (77-79°F) to keep the house warm.
Usually, it was even lower, around 24°C (75°F). However, I still find 27°C (81°F) to be very, very tight.

RotesDach schrieb:

The product datasheet states (as with many other similar vinyl floors) that the maximum supply temperature of the underfloor heating should not exceed 27 degrees.

Reading helps, quote from the Joka 555 XXL product datasheet:
“4. Hot water underfloor heating systems are suitable up to a maximum surface temperature of 29°C (84°F).”

For 29 degrees (not 27) you would need sauna-like temperatures. I have no idea what the supply temperature would be, but it will be at least 40°C (104°F) ;-)