Stiebel Eltron WPL-HT Hochtemperatur
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The WPL-HT line from Stiebel Eltron is built explicitly for renovating older buildings. Where underfloor heating hasn't been installed and the radiators are staying put, this unit delivers enough flow temperature to keep rooms warm even at minus 15 degrees outside.
In Switzerland these units are installed through the Platinum partner network. The Swiss website includes a sizing calculator and guidance on which buffer tank size fits which building size. Pairing a high-temperature heat pump with an additional electric heating element for extreme cold is a solution often chosen for older single-family homes.