HWB-E electric hot water boiler

The HWB-E is a pressurised hot water boiler in which electric heating elements warm water in a closed circuit without it reaching the steam phase. TSB builds it for up to 3500 kW (3 000 000 kcal/h) and up to 16 bar (232 psig). It needs no burner, flue or fuel tank, releases no COx, NOx or SOx at the point of use and runs almost silently.

Most of the pressure in the vessel comes from the initial fill pressure supplied by a booster set or the mains; heating the water adds very little, so a crack in the shell would not cause damage in the boiler room. SSRs and multi-stage temperature control match output to heat demand at once: the boiler reacts quickly to load changes and, when required, uses the full available grid power for a fast cold start. It serves space heating, notably in greenhouses and on farms, as well as food, pharmaceutical, chemical and paper processes; flow temperature can follow the outdoor temperature via 3- or 4-way motorised valves.

The boiler is delivered on a single skid. Shell and end plates are P355GH boiler plate to EN 10028-2. The DIN-compliant flanged heaters are made from seamless stainless steel tubes of at least AISI304 grade; Incoloy-sheathed elements work at 70–75 W/in² and withstand overvoltage of up to 10 %. The PLC supervises overpressure and temperature protection, heater surface temperature and emergency shutdown, and shares data via Modbus, Modbus TCP/IP or Profinet. Design follows EN 12953, PED 2014/68/EU and ASME Section VIII Div. 1.