A Deep Dive Into LPHW Unit Heaters
Reventon S-3S LPHW Unit Heater
Reventon S-3S LPHW Unit Heater
Apen AX LPHW Unit Heater
Reventon S-3S LPHW Unit Heater
Low Pressure Hot Water (LPHW) unit heaters remain one of the most reliable and effective heating solutions for industrial and commercial buildings across the UK. They deliver fast, consistent warm air and are well-suited to warehouses, logistics centres, workshops, production areas and retail back-of-house spaces.
What Are LPHW Unit Heaters?
LPHW unit heaters operate by circulating hot water through a coil or heat exchanger. A fan blows air over this heated surface, distributing warm, comfortable air throughout the building.
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The hot water is generated by:
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Gas or oil boilers
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Heat pumps
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Hybrid heat pump & boiler systems
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District or centralised heating systems
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Because they rely on a central hot water source, LPHW heaters offer consistent performance and a long operational lifespan.
Key Benefits of LPHW Unit Heaters
1. Efficient Heat Distribution
LPHW unit heaters can rapidly warm large volumes of air, helping industrial spaces maintain stable and comfortable working conditions.
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2. Wide Range of Installation Options
They can be wall-mounted, column-mounted or suspended from the ceiling, making them suitable for challenging layouts or where floor space id limited.
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3. Low Maintenance Requirements
With minimal moving parts and robust construction, LPHW heaters typically require less servicing over their lifecycle than many alternative options.
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4. Compatible With Modern Heating Systems
LPHW heaters work effectively with condensing boilers, high-efficiency boilers, heat pumps, hybrid systems and electric boilers.
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5. EC Fan Options For Lower Electrical Consumption
Many modern LPHW units, including those supplied by Hadar, offer EC fans, allowing improved electrical efficiency and quieter operation.
Apen AX LPHW Unit Heaters​
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The Apen AX range is a durable, high-performance series designed for demanding commercial and industrial environments. Known for its strong build quality and reliable heat exchangers, the AX is frequently installed in large-scale warehouse, production areas and workshops.
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Key Features:
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High-quality heat exchangers
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Strong air throw for effective heat distribution
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multiple mounting configurations
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EC fan options available for improves electrical efficiency and quieter operation
Reventon S-3S​ LPHW Unit Heater
The Reventon S-3S is a modern, lightweight LPHW unit heater offering strong performance in a compact form. Its design makes it ideal for a wide variety of commercial and industrial applications.
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Key Features:
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Corrosion resistant heat exchangers
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Lightweight, easy-to-install construction
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Quiet but powerful airflow
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Contemporary design quited to modern buildings
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EC fan options available to reduce electrical consumption. ​
Looking For Guidance on LPHW Heating Systems?​
If you're exploring LPHW unit heaters for your warehouse, workshop, distribution centre or commercial unit, or if you want expert advice on choosing between LPHW models such as the Apen AX or Reventon S-3S, the Hadar team is ready to help. Our specialists can assess your building, review the heat-load requirements, and recommend the most suitable configuration for your space.
Contact us today to discuss your project and discover the best heating solution for your facility.