Agentis Internal Heat Only

One of the most efficient oil boiler ranges in the UK & Irish markets with efficiency figures in excess of 90% helping to reduce heating bills and reducing carbon emissions. Using Warmflow’s unique patented heat exchanger with the latest Riello low NOx burner technology.

The Agentis internal 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 to fit specifically into kitchen and utility rooms, its compact sizing and stylish white casing ensures the Warmflow Agentis range is the ideal solution for all indoor installations.

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Boiler Stats

Models I21 I26 I33 I44
Models I21 I26 I33 I44
Output (kW) 15-21 21-27 27-33 33-44
Flue Options C/F, low/ high/ vertical B/F C/F, low/ high/ vertical B/F C/F, low/ high/ vertical B/F C/F, low/ high/ vertical B/F
C/F size (mm) 100 100 100 100
ErP Heating Rating rating rating rating rating
Height (mm) 865 865 865 1155
Depth (mm) 602 602 602 872
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

Internal combi stickers

Agentis Internal Combi

I21 C / I26 C / I33 C
  • Warmflow’s unique, patented 5mm stainless steel heat exchanger technology
  • Latest Riello low NOx burner
  • One of the slimmest oil boilers on the market at 515mm wide
  • Factory fitted 24ltr expansion vessel, 32 plate heat exchanger
  • Factory fitted pressure reducing & relief valves as standard
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • Stylish white casing suitable for all indoor installations
  • Outputs ranging from 15-33kW
  • Quiet operation
  • Extended warranty for Warmflow Connect installers (subject to ts & cs)
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Internal system stickers

Agentis Internal System

I21 S / I26 S / I33 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.
  • Stylish white casing suitable for all indoor installations
  • Outputs ranging from 15-33kW
  • Quiet operation
  • Extended warranty for Warmflow Connect installers (subject to ts & cs)
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Internal pumped stickers

Agentis Internal Pumped

I21 P / I26 P / I33 P / I44 P
  • Warmflow’s unique, patented 5mm stainless steel heat exchanger technology
  • Latest Riello low NOx burner
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • Stylish white casing suitable for all indoor installations
  • Outputs ranging from 15-44kW
  • Quiet operation
  • Extended warranty for Warmflow Connect installers (subject to ts & cs)
View boiler details