When it comes to heating large commercial and industrial buildings, few systems are as effective and energy-efficient as Low Pressure Hot Water (LPHW) unit heaters. They use hot water from a central heat source to deliver consistent, controllable warm air across large open spaces, making them ideal for warehouses, factories, workshops, distribution centres and sports halls throughout the UK.

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How LPHW Unit Heaters Heat Large Buildings

 

LPHW unit heaters receive hot water from a central boiler or heat pump through pipework. Inside each unit, the hot water passes through a finned coil. A fan draws in air and blows it over the heated coil, where it picks up heat from the water and is blown out into the space. Multiple heaters can be connected to a single central plant to heat an entire warehouse or factory, with no gas connection and no flue needed at each unit.

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This makes LPHW particularly well suited to large buildings:

• Fast warm-up: Multiple heaters working from a single plant rapidly bring large spaces up to temperature

• Even distribution: Heaters positioned throughout the building prevent cold spots and maintain consistent temperatures

• No gas or flue at the unit: Simplifies installation, reduces maintenance and improves indoor air quality

• Flexible mounting: Wall, column or ceiling-suspended to suit any layout and save floor space

• Works with any heat source: Gas boilers, oil boilers, condensing boilers, heat pumps, hybrid systems and electric boilers

• Heat pump ready: Transition to a heat pump in the future without replacing the heaters

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Apen AX LPHW Unit Heater

 

The Apen AX covers 7 to 125kW, making it suitable for everything from small workshops to large warehouses. It offers heating and cooling modes for year-round climate control, optional EC fan motors for quieter operation, horizontal or vertical mounting and compatibility with both boilers and heat pumps.

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Reventon S-3S LPHW Unit Heater

 

The Reventon S-3S covers 2 to 66kW and weighs just 12 to 25kg, making it one of the lightest LPHW unit heaters on the market. It features a powder-coated galvanised steel casing for corrosion resistance, a 3-speed fan with IP54 protection and 1, 2 or 3-row heat exchanger options to match different water temperatures and heating demands.

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Where LPHW Unit Heaters Are Used in Large Buildings

 

LPHW unit heaters are used across warehouses, distribution centres, factories, workshops, sports halls and garden centres. They are particularly effective in buildings that already have a central boiler or where a new central plant is being specified.

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Future-Proof: Pairing LPHW with a Heat Pump

 

One of the biggest advantages of LPHW is that it is already heat pump ready. A building can start with a gas or oil boiler today and transition to an air source heat pump or Apen AquaPump hybrid heat pump in the future without replacing the heaters. The pipework and units stay the same. Only the central heat source changes. This makes LPHW a future-proof investment for businesses planning a phased pathway to lower carbon heating.

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If you are looking to heat a large warehouse, factory or sports hall, contact Hadar Industries today for a free site survey. Our team will assess your building and recommend the right LPHW configuration for efficient, future-proof heating.