This heat-only boiler provides oil-fired central heating for commercial and industrial installations. It is a wall-mounted unit designed to supply a dedicated heating circuit with a rated thermal output of 21 kW and is intended for use where a standalone heat source is required rather than combined hot-water generation.

Grant Vortex Eco Internal Wall Hung 16/21 21 kW Oil Heat Only Boiler VTXWH16/21 ERP

This system boiler provides central heating and hot water operation for oil‑fuelled installations and is intended for wall‑mounted installation with compatible flue arrangements. It is designed for use with Grant EZ‑Fit low‑level, high‑level and vertical flue systems and suits technical environments where compact, efficient heat generation is required.

Grant Vortex Eco Internal Wall Hung 21 kW Oil System Boiler VTXSWH16/21 ERP

This combi boiler provides oil-fired central heating and hot water generation for domestic and light commercial settings. It is a floor-mounted unit from the Agentis Internal range, designed to deliver continuous hot water at a practical service flow while operating as a single-package heating source.

Warmflow Agentis Internal 21 kW Oil Combi Boiler I21C

This combi boiler provides oil-fired heating and domestic hot water generation for commercial and industrial settings. It is a floor-mounted unit designed for installation where robust, continuous thermal output and a compact plantroom footprint are required. The unit delivers sustained heat output and efficient operation suitable for integration with building services and process heating systems.

Warmflow Agentis Pro Internal 21 kW Oil Combi Boiler I21CPRO

This system boiler provides central heating and hot water generation powered by liquid fuel for commercial and industrial settings. Designed as a floor‑mounted unit, it delivers mid‑range thermal capacity and is intended for installations where a compact footprint and efficient oil combustion are required.

Warmflow Agentis Internal 21 kW Oil System Boiler I21S

This heat-only boiler provides oil-fired central heating for domestic and light-commercial plantrooms, configured for internal installation within the Agentis Internal range. It operates as a floor-mounted unit delivering a steady heating output suitable for radiator circuits and indirect hot-water systems, and is finished in a white cabinet to blend into utility spaces.

Warmflow Agentis Internal I21 21 kW Oil Heat Only Boiler I21

This heat-only boiler provides oil-fired central heating for commercial and industrial settings where a dedicated space-heating source is required. Designed as a floor-mounted unit with a white finish, it integrates into plant rooms to supply heat to existing heating circuits and systems that require a separate hot water cylinder. The product is intended for applications demanding steady thermal output and straightforward installation into mechanical infrastructure.

Warmflow Agentis Professional Internal 21 kW Oil Heat Only Boiler I21PRO

Designed for use in a boiler house or garage, the Warmflow Agentis I21SPRO internal oil system boiler is fully factory-wired with a burner and thermostat and has been ready-fitted with a condensate trap, making installation that much easier. With flow and return connections on top, this blue-cased unit houses a highly efficient heat exchanger and an up-to-the-minute Riello low NOx burner. Quiet in operation, this 21kW floor standing boiler is also extremely efficient, earning it an ErP A rating.

Warmflow Agentis I21SPRO internal system oil boiler 21kW

Supplied with a range of valuable add-ons, including the Adey MagnaClean Pro 2 for a cleaner, safer system, the Warmflow Agentis Pro I21PPRO professional internal regular boiler is a cost-effective choice for heating a home. Fast and easy to fit, this stylish 21kW boiler is designed for installation in a kitchen or utility room and with a highly efficient heat exchanger and low-NOx burner technology built-in it maintains an ErP A rating for lower fuel bills and less waste.

Warmflow Agentis Professional I21PPRO internal pumped heat only oil boiler 21kW

An ErP A rated internal heat only boiler designed to fit into kitchen & utility room applications. It's stylish white casing houses a highly efficeint, patented heat exchanger and the latest Riello low Nox technology.

Warmflow Agentis internal heat only oil boiler 21kw

Looking for 21 kw internal oil boiler? Order from Wolseley today - free delivery or click and collect available nationwide.

21 Kw Internal Oil Boiler