Warmflow Agentis External Combi Oil Boiler 15–21kW
Warmflow Agentis External Combi Oil Boiler 15–21kW
(Approx. 3-5 working days)
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The Warmflow Agentis E21C is an external, oil fired condensing combi boiler designed for outdoor installation. It combines central heating and domestic hot water in one compact unit, delivering a heating output of 15–21kW and a domestic hot water flow rate of 18 litres per minute at a 35°C rise. The boiler is housed in an IP45 rated weatherproof casing for protection against the elements.
This combi oil boiler uses kerosene as fuel 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, classified as NOx Class 3, and has a SAP seasonal efficiency of 89.6%. Noise emissions are approximately 52 dB(A), ensuring quiet operation.
Factory fitted components include a 24 litre hinged expansion vessel, pressure relief and reducing valves, a domestic hot water mini expansion vessel, and a Grundfos UPM3 Flex AS circulating pump. 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 top.
- Output range: 15–21kW for heating
- Domestic hot water flow: 18 l/min at 35°C rise
- IP45 rated casing for outdoor weather protection
- Riello low NOx burner (NOx Class 3) reduces emissions
- SAP seasonal efficiency: 89.6%
| Brand | Warmflow |
|---|---|
| Width | 550 mm |
| Applicable Standards | OFTEC Approved |
| Depth | 700 mm |
| Flow Rate | 18 l/min |
| Flue Included | No |
| Fuel Type | Kerosene & HVO |
| Heating Energy Rating | A |
| Heat Output Range | 15–21kW |
| Height | 900 mm |
| Heating Output | 21 kW |
| Min Heat Output | 15 |
| Model Name / No | E21C |
| Water Energy Rating | A |
| Colour | Grey |
| Domestic Hot Water Output | 24 |
| 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 | 89.6% |
| DHW Heat Exchanger | 32 plate stainless steel |
| Expansion Vessel | 24 litre hinged |
| Pump | Grundfos UPM3 Flex AS |
- 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 E21C is an external, oil fired condensing combi boiler designed for outdoor installation. It combines central heating and domestic hot water in one compact unit, delivering a heating output of 15–21kW and a domestic hot water flow rate of 18 litres per minute at a 35°C rise. The boiler is housed in an IP45 rated weatherproof casing for protection against the elements.
This combi oil boiler uses kerosene as fuel 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, classified as NOx Class 3, and has a SAP seasonal efficiency of 89.6%. Noise emissions are approximately 52 dB(A), ensuring quiet operation.
Factory fitted components include a 24 litre hinged expansion vessel, pressure relief and reducing valves, a domestic hot water mini expansion vessel, and a Grundfos UPM3 Flex AS circulating pump. 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 top.
- Output range: 15–21kW for heating
- Domestic hot water flow: 18 l/min at 35°C rise
- IP45 rated casing for outdoor weather protection
- Riello low NOx burner (NOx Class 3) reduces emissions
- SAP seasonal efficiency: 89.6%
| Brand | Warmflow |
|---|---|
| Width | 550 mm |
| Applicable Standards | OFTEC Approved |
| Depth | 700 mm |
| Flow Rate | 18 l/min |
| Flue Included | No |
| Fuel Type | Kerosene & HVO |
| Heating Energy Rating | A |
| Heat Output Range | 15–21kW |
| Height | 900 mm |
| Heating Output | 21 kW |
| Min Heat Output | 15 |
| Model Name / No | E21C |
| Water Energy Rating | A |
| Colour | Grey |
| Domestic Hot Water Output | 24 |
| 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 | 89.6% |
| DHW Heat Exchanger | 32 plate stainless steel |
| Expansion Vessel | 24 litre hinged |
| Pump | Grundfos UPM3 Flex AS |
- 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.