Agentis External Heat Only

The Agentis external oil boiler combines Warmflow’s unique, patented high efficiency 5mm stainless steel heat exchanger technology with the latest Riello low NOx burner technology to create a range of high efficiency oil boilers which offer some of the best efficiency ratings in the UK & Irish markets.

Designed for outdoor use with its IP45 rated, no maintenance, weatherproof casing and multi directional flue which comes included as standard.

Register on Connect Manuals / Brochures ERP Labels Servicing

Boiler Stats

Models E21 E26 E33 E44
Models E21 E26 E33 E44
Output (kW) 15-21 21-27 27-33 33-44
Flue Options L,R or rear. Optional Top L,R or rear. Optional Top L,R or rear. Optional Top L,R or rear. Optional Top
C/F size (mm) n/a n/a n/a n/a
ErP Heating Rating rating rating rating rating
Height (mm) 900 900 900 1155
Depth (mm) 700 700 700 876
Width (mm) 413 413 413 595
Flow Connection 28mm 28mm 28mm 1¼" BSP
Return Connection 1" BSP 1" BSP 1" BSP 1¼" BSP
Service Access front front front front
DHW Flow (I/min) n/a n/a n/a n/a

Explore other models

External combi stickers

Agentis External Combi

E21 C / E26 C / E33 C
  • Warmflow’s unique, patented 5mm stainless steel heat exchanger technology
  • Latest Riello low NOx burner
  • Factory fitted 24ltr hinged expansion vessel, 32 plate heat exchanger
  • Factory fitted pressure reducing & relief valves as standard
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • No maintenance, IP45 rated anthracite grey casing
  • Multi directional flue included as standard
  • Outputs ranging from 15-33kW
  • Quiet operation
  • HVO Ready
View boiler details
External pumped stickers

Agentis External Pumped

E21 P / E26 P / E33 P / E44 P
  • Warmflow’s unique heat exchanger technology
  • Latest Riello low NOx burner
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • No maintenance, IP45 rated anthracite grey casing
  • Outputs ranging from 15-44kW
  • Multi directional flue included as standard
  • Quiet operation
  • HVO Ready
View boiler details
External system stickers

Agentis External System

E21 S / E26 S / E33 S
  • Warmflow’s unique, patented 5mm stainless steel heat exchanger technology
  • Latest Riello low NOx burner
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • Factory fitted sealed system including 12ltr rectangular expansion vessel for more space within the appliance.
  • No maintenance, IP45 rated anthracite grey casing
  • Multi directional flue included as standard
  • Quiet operation
  • HVO Ready
View boiler details