The robust construction UST-DR-HR(Z) is used in all district heating networks with high requirements.
Due the special character of the inner tube with a cross angle a temperature pitch of 3°C is reached.

The double tube heat exchanger WUF has been specifically designed for district heating systems with high pressures. Thanks to the modular design of double tube heat exchanger WUF (district heat exchanger) are these suitable for family homes, apartment buildings through to commercial premises.

The domestic hot water is supplied via an inner coiled tubing with a large exchange surface (double-register boiler).


Heat exchanger WUF          tubes P235 GH with APZ 3.1
Double-register boiler          carbon steel enamelled (optional stainless)

Max. operating conditions
  Pressure Temperature
Primary side
PN40 200°C
Secondary side
PN6/10 100°C


•    output from 15-500 kW (higher output on request)
•    double-register boiler 300 l to 1'000 l (larger volumes on request)
•    including complete piping
•    including control unit with wiring


•    heat counter, differential pressure regulator / volume current limiting device, control points etc.
•    several heating groups
•    circulation
•    frame profile housing
•    Isolation

Thermally optimized components

The modular design of double tube heat exchanger WUF and a technical optimization ensures that a temperature pitch of 3-5°C (depending on requirements) is reached.


•    short delivery times
•    easy service
•    modular construction
•    upgradeable to higher output


RemCal AG
Wilerstrasse 2180
CH-9230 Flawil
Phone +41 71 555 11 00

ConVacc AG
Wilerstrasse 2180
CH-9230 Flawil
Phone +41 71 394 14 80