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DRU Flue systems explained

Balanced flue, powered flue or conventional flue
Before you buy a gas heater, you need to select the heaters and flue types that best suit your premises. Here are some of the benefits of each appliance and flue system?

Balanced Flue – Art, Style and Diamond series

  • Flue consists of two concentric tubes. Outer tube draws fresh air for combustion, while waste gases are expelled via the inner tube
  • Natural convection heating, quiet and more efficient than heating water
  • Additional fran assistance on Diamond models
  • No danger of freezing and no need for anti-corrosive additives
  • Heater is up to maximum output in 30 minutes
  • Heat distribution: 85% convection/15% radiant for perfect comfort
  • Heat exchangers coated in Ceramet for longer life with extended warranty
  • Can accommodate wall thicknesses from 70 to 980 mm.
  • Die cast aluminium flue terminal 
  • Integral modulating thermostat with capillary sensor
  • Aerated steel burner with stainless steel head for positive and silent ignition. 
  • No electrical supply required but can be connected to automatic time clock
  • Terminal guards and Internal heater guards available 
  • Natural or Propane gas

Powered flue – Kamara series

  • Flue consists of two concentric tubes (100mm outer and 60mm inner) and can be core drilled using 105mm bit for quick installation 
  • Flue extensions available up to 1 metre 
  • Fan pulls air into a combustion chamber and pushes exhaust gases back outside 
  • Electronic sequence control for continuous safety checks 
  • Electronic spark ignition and Integral thermostat 
  • Delivers heat at floor level with 15 minutes warm–up time 
  • Cool touch and easy-clean outer casing 
  • Set up for remote time clock connection 
  • One piece outer casing for ease of servicing with lockable control panel 
  • Terminal guards and Internal heater guards available 
  • Extended manufacturer warranty on heat exchangers 
  • Over 90% efficiency 
  • Natural or Propane gas

Conventional Flue – S-Line and Pigalle

  • Connects to existing chimney or flue pipe for flexibility of location 
  • Natural convection (virtually silent in operation) 
  • Free standing heaters 
  • No electrical supply needed 
  • Can be connected to a time clock if required 
  • Integral modulating thermostat with capillary sensor 
  • Natural or Propane gas


A company founded in 1754
UK commercial heating specialists since 1975
Market leaders in church heating
School heating solutions for independent and state schools
Flexible heating systems for offices and industrial premises
Heating for homes, extensions and conservatories
Gas heating appliances with up to 90% efficiency
National network of GAS SAFE registered engineers
Experienced technical support staff

By Appointment of the
Court of the Netherlands