Warmflow Agentis External Combi Boiler

E21 S / E26 S / E33 S

  • AA Rating on M & XL load profile
  • Riello low NOx technology
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • 24l Factory fitted, hinged expansion vessel
  • Frost thermostat
  • Low component count
  • DHW expansion vessel
  • DCW inlet shut off valve
  • factory fitted DCW pressure reducing valve
  • Push in o-ring fittings
  • Slim design
  • Integrated 7 day programmer


Warmflow has an outstanding selection of high efficiency, internal and external oil-fired boilers – including the UK & Ireland’s only AAA-rated oil boiler – you can also save both installation time and money with their new Professional range of oil boilers which comes with over £250 worth of factory fitted accessories as standard including an Adey Magnacelan Pro 2, Teddington fire valve and Crosland oil filter and much more!

Additional information

E21 C

Output 15-21kW, Height 900mm, Depth 700mm, Width 550mm

E26 C

Output 21-27kW, Height 900mm, Depth 700mm, Width 550mm

E33 C

Output 27-33kW, Height 900mm, Depth 700mm, Width 550mm