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Hybrid Water Heater

The LPG-fueled hybrid water heaters combine traditional boiler technology with the power of an engine driven heat pump to reduce dramatically fuel consumption and carbon emissions.  They are suitable for a wide range of commercial premises such as offices, hotels, restaurants, schools and showrooms.

Free waste heat from the engine (in the form of hot flue gases) is captured and reused which adds to the unit's capacity and fuel efficiency. The synergy of advanced heat pump and engine technology results in twice the efficiency of a traditional gas fired boiler.

By precisely matching the unit’s thermal output to the heating demands of the building, energy waste is minimised.


  • An advanced thermodynamic cycle extracts available energy from the environment, and uses mechanical work from a gas engine (gaseous LPG) to pump this heat to a higher useful temperature.  
  • A Highly efficient heat pump reclaims engine waste heat resulting in an approx. coefficient of performance (COP) of 1.2 to 2.2.
  • Hot water output temperature ranges of approx. 35°C - 75°C. can be achieved (approx. 120 to 175 kW of hot water - ideal for various purposes)


LPG is the cleanest, usually most cost effective of main fossil fuels (obtained also separately from gaseous sources) and perfect for commercial heating and commercial boilers. High efficiency LPG powered commercial condensing boilers can offer a practical and environmentally friendly solution for many businesses located beyond mains gas grids.

Its energy efficiency means that LPG commercial heating systems and solutions offer considerable advantages, both economic and environmental, over other fossil fuels such as oil.

LPG has a low carbon to hydrogen ratio which means that it will generate lower amounts of CO2 per unit of heat produced. This can lead to as much as a 50% reduction in carbon footprint. It burns cleanly and efficiently and usually lowers running costs.

LPG has a comparably high heating value, ie energy per kg.

According to the UN international panel on climate change (IPCC), LPG is not a greenhouse gas, meaning it is assigned a global warming potential (GWP) factor of 0. The IPCC lists the GWP factor of CO2 as 1 (by definition as it is the equivalent measure of a carbon footprint) and methane as 25.

  • These units provide easily integrated heating systems.
  • Water heating is reliable and consistent.
  • Investment costs are relatively low and cost savings provide a quick payback.
  • Fully modulating systems.
  • Compatible with renewable technologies.
  • Minimal electrical power requirement - similar to house-hold appliances

Manufacturers (1) and Resources