JHT Series High Temperature

The JHT Series is a three pass reverse flame horizontal firetube medium temperature hot water boiler suitable for use with liquid and gaseous fuels:

The range consists of 13 models available in either 12 bar.g or 14.8 bar.g designs with heat outputs from 160 to 3,500 kW.



  • Standard design pressures 12 bar.g or 14.8 bar.g
  • Maximum operating temperature 191°C (12 bar.g) or 200°C 14.8 bar.g.
  • Deep penetration plate / plating welding, with the smoke-tubes expanded prior to being welded to the tube plate.
  • Fitted with patented stainless steel turbulators, positioned inside the smoke-tubes to improve heat exchange.
  • Boiler body insulated with high-density mineral wool and stainless steel cladding to minimise heat loss.
  • The door is insulated on the inside with a layer of refractory concrete which covers the entire heated surface of the tube plate.
  • Front door with reversible opening (right and left) and closing system with micrometric adjustment on the front of the boiler.
  • All parts subject to pressure are welded by qualified and IIS approved personnel, to standards EN 15614 and EN 287.
  • The water circuit can be inspected through a manhole on the top of the boiler and a hand opening ring at the bottom.
  • The boiler drain can be located on either side of the boiler
  • Easy access to the furnace and tube bundle through the door and the removable smokebox.
  • Top access platform when required by size.


  • CE mark in accordance with the following directives
  • Pressure Equipment Directive 97/23/EC (PED)
  • Low Voltage (2006/95 EEC)
  • Electromagnetic Compatibility (2004/108 EEC)