Varmax stainless steel floor standing boiler.
Floor standing, high output condensing boiler with a stainless steel heat exchanger.

The range consists of 8 single boilers with outputs (at 50/30°C) of 127, 148, 191, 238, 290, 338, 415 and 478kW. Also available are 4 dual models with combined outputs (at 50/30°C) of 580, 676, 830 and 956kW. 
  • Improved efficiency on split temperature systems due to twin return connections

  • Nondependent on system flow allowing wide differential temperatures

  • Easier installation with no requirement for dedicated primary circuit

  • Tolerant to a wide range of system water conditions with a corrosion resistant stainless steel heat exchanger

  • Long life backed up by a 5-year heat exchanger warranty

  • Well insulated for low standby losses

  • Maximum BREEAM credits available with NOx emissions lower than 40mg/kWh

  • Match heating system loads accurately with outputs up to 900kW and a 5:1 turndown ratio

  • Simplified flue system design as the flue gas non-return valve is built in to provide effective protection from re-circulation of flue gases through non-firing boilers

  • Advanced built in Siemens controls platform with sequence control for up to 16 boilers, multiple heating circuits and a hot water circuit using the master/slave principle

  • Quick release access panels for ease of service and maintenance

Contact us to help you to find the right product for your project.
  Title Type Size  
Varmax boiler brochure Varmax boiler brochure Product brochures 7744 kB Download
Varmax boiler dimensions Varmax boiler dimensions Dimensions 458 kB Download
Varmax technical data tables Varmax technical data tables Data tables 88 kB Download
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Varmax accessory AVS75 installation manual Varmax accessory AVS75 installation manual Installers guides 2767 kB Download
Varmax Boiler installation manual Varmax Boiler installation manual Installers guides 17494 kB Download
Varmax Dual Boiler installation manual Varmax Dual Boiler installation manual Installers guides 5591 kB Download
Volt Free Contact (VFC) and switch fitting instructions Volt Free Contact (VFC) and switch fitting instructions Installers guides 1349 kB Download
Varmax boiler seasonal efficiency data Varmax boiler seasonal efficiency data Seasonal efficiency sheets 149 kB Download
Varmax scheme 1 - single boiler with split temperature heating and DHW Varmax scheme 1 - single boiler with split temperature heating and DHW Hydraulic schematics 126 kB Download
Varmax scheme 2 - single boiler with multiple split temperature heating circuits and DHW Varmax scheme 2 - single boiler with multiple split temperature heating circuits and DHW Hydraulic schematics 138 kB Download
Varmax scheme 3 - multiple boilers with multiple split temperature heating and DHW circuit Varmax scheme 3 - multiple boilers with multiple split temperature heating and DHW circuit Hydraulic schematics 149 kB Download
Varmax scheme 4 - multiple boilers with low loss header Varmax scheme 4 - multiple boilers with low loss header Hydraulic schematics 139 kB Download
Varmax boiler 120kW-140kW CAD Varmax boiler 120kW-140kW CAD CAD 184 kB Download
Varmax boiler 180kW-225kW CAD Varmax boiler 180kW-225kW CAD CAD 192 kB Download
Varmax boiler 275kW-320kW CAD Varmax boiler 275kW-320kW CAD CAD 191 kB Download
Varmax boiler 390kW-450kW CAD Varmax boiler 390kW-450kW CAD CAD 194 kB Download
Varmax boiler 550kW-640kW CAD Varmax boiler 550kW-640kW CAD CAD 348 kB Download
Varmax boiler 780kW-900kW CAD Varmax boiler 780kW-900kW CAD CAD 350 kB Download
  • Split temperature systems such as a combination of radiator loops/air convectors and underfloor heating

  • Medium to large sized district heating schemes

  • Schools

  • Shopping centres

  • Offices

  • Sports facilities

  • Health facilities such as care homes, hospitals
Optional extras
  • A large range of off the shelf flue options available 
  • Room sealed and open flue solutions
  • Flue header kits
  • Unvented kits 
Single Boiler Controls
  • Outside air temperature sensor QAC34 (Part no. 533901457)
  • Domestic Hot Water sensor kit (sensor and pocket) QAZ36 (Part no. 563605674)
  • Mixing valve heating circuit control kit (AVS 75 control module, temperature sensor and pocket) for 1 zone (Part no. 059751)
  • Programmable room sensor QAA75 (Part no. 533901587)
  • Offset adjustable room sensor QAA55 (Part no. 533901589)
Multiple Boiler Controls
  • Outside air temperature sensor QAC34 (Part no. 533901457)
  • Heating circuit sensor kit (sensor and pocket) QAZ36 (Part no. 563605673)
  • Merley boiler sequence controller, wall mounted (Part no. 563605672)
  • LPB Bus communication module OCI345, one required per boiler module (Part no. 563605667)
  • Programmable room sensor QAA75 (Part no. 533901587)
  • Offset adjustable room sensor QAA55 (Part no. 533901589)