Warmflow Agentis External Oil Boiler 21–27kW
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Warmflow Agentis External Oil Boiler 21–27kW
(Approx. 3-5 working days)


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The Warmflow Agentis E26 is an external, heat only oil fired condensing boiler designed for outdoor installation. It provides a central heating output of 21–27kW and is housed in an IP45 rated weatherproof casing, eliminating the need for additional protection against the elements.
This oil boiler operates on kerosene and is HVO ready for renewable liquid fuels. It features a patented 5mm stainless steel heat exchanger for improved thermal efficiency and incorporates a Riello low NOx burner to meet current emission standards. The boiler is ErP A-rated for energy efficiency and engineered for quiet operation.
Installation flexibility is provided by a multi-directional flue system, allowing discharge to the left, right, or rear, with an optional top outlet. Service access is from the front, and connections include a 28mm flow and 1" BSP return. The unit is floor mounted and designed for reliable performance in external environments.
- Output range: 21–27kW for central heating
- IP45 rated casing for outdoor weather protection
- Patented 5mm stainless steel heat exchanger for efficiency
- Riello low NOx burner reduces harmful emissions
- Multi-directional flue included for flexible installation
| Brand | Warmflow |
|---|---|
| Width | 413 mm |
| Energy Rating | Not Selected |
| Applicable Standards | OFTEC Approved |
| Depth | 700 mm |
| Flue Included | No |
| Fuel Type | Kerosene & HVO |
| Heating Energy Rating | A |
| Heat Output Range | 21-27kW |
| Height | 900 mm |
| Heating Output | 27 kW |
| Min Heat Output | 21 |
| Model Name / No | E26 |
| Weight | 128 kg |
| Usage | External Use |
| Colour | Grey |
| Mount Type | Floor Mounted |
| Hydrogen Ready | No |
| NOx Class | Class 3 |
| Residential Warranty | 2 years standard (extendable to 5 years) |
| Sound Power Level (dB A): | 52 dB |
| Burner Type | Riello RDB 2.2 |
| Casing Material | Powder Coated Steel |
| Condensate Trap | Integrated |
| Frost Protection | Built-in Thermostat |
| Seasonal Efficiency | 88.4% |
- Delivery cost will be calculated at checkout once delivery address has been confirmed
- Delivery lead times are an estimate only
- Delivery drivers will always prioritise safety over convenience when offloading materials
- Bagged products such as cement and plaster cannot be returned once opened
- Jumbo bags cannot be returned once delivered
- All other goods may be returned within 3 months with a proof of purchase provided
- Chargeable pallets may be returned for a full refund
- All online pricing is specific to Northern Ireland only. Pricing for our Isle of Man branch may vary.
The Warmflow Agentis E26 is an external, heat only oil fired condensing boiler designed for outdoor installation. It provides a central heating output of 21–27kW and is housed in an IP45 rated weatherproof casing, eliminating the need for additional protection against the elements.
This oil boiler operates on kerosene and is HVO ready for renewable liquid fuels. It features a patented 5mm stainless steel heat exchanger for improved thermal efficiency and incorporates a Riello low NOx burner to meet current emission standards. The boiler is ErP A-rated for energy efficiency and engineered for quiet operation.
Installation flexibility is provided by a multi-directional flue system, allowing discharge to the left, right, or rear, with an optional top outlet. Service access is from the front, and connections include a 28mm flow and 1" BSP return. The unit is floor mounted and designed for reliable performance in external environments.
- Output range: 21–27kW for central heating
- IP45 rated casing for outdoor weather protection
- Patented 5mm stainless steel heat exchanger for efficiency
- Riello low NOx burner reduces harmful emissions
- Multi-directional flue included for flexible installation
| Brand | Warmflow |
|---|---|
| Width | 413 mm |
| Energy Rating | Not Selected |
| Applicable Standards | OFTEC Approved |
| Depth | 700 mm |
| Flue Included | No |
| Fuel Type | Kerosene & HVO |
| Heating Energy Rating | A |
| Heat Output Range | 21-27kW |
| Height | 900 mm |
| Heating Output | 27 kW |
| Min Heat Output | 21 |
| Model Name / No | E26 |
| Weight | 128 kg |
| Usage | External Use |
| Colour | Grey |
| Mount Type | Floor Mounted |
| Hydrogen Ready | No |
| NOx Class | Class 3 |
| Residential Warranty | 2 years standard (extendable to 5 years) |
| Sound Power Level (dB A): | 52 dB |
| Burner Type | Riello RDB 2.2 |
| Casing Material | Powder Coated Steel |
| Condensate Trap | Integrated |
| Frost Protection | Built-in Thermostat |
| Seasonal Efficiency | 88.4% |
- Delivery cost will be calculated at checkout once delivery address has been confirmed
- Delivery lead times are an estimate only
- Delivery drivers will always prioritise safety over convenience when offloading materials
- Bagged products such as cement and plaster cannot be returned once opened
- Jumbo bags cannot be returned once delivered
- All other goods may be returned within 3 months with a proof of purchase provided
- Chargeable pallets may be returned for a full refund
- All online pricing is specific to Northern Ireland only. Pricing for our Isle of Man branch may vary.


