How to heat water efficiently in large buildings

Heating hot water in large buildings such as hotels, hospitals and sporting clubs is an expensive business.

With world-wide spiralling energy costs and increased demand for both energy efficiency and reductions in greenhouse gas emissions, more and more hotels are turning to Calorex heat pumps to solve their water heating demands.

Hot water heat pumps are particularly suited to hotter climates such as the Middle East and South East Asia, and Calorex heat pumps are specifically designed to maximise the benefit these temperate climates offer. All Calorex hot water heat pumps are pre-charged with R134a – an ozone friendly refrigerant that can reliably provide hot water up to 68°C – and in all climates, hot or cold. Many hotels in the Far East and Middle East such as Hilton, Holiday Inn, Marriott, InterContinental and Ritz-Carlton, to name a few, have already recognised the benefit of this win-win situation by installing Calorex heat pumps and currently enjoy 24/7 low cost hot water production.

As a further benefit all Calorex heat pumps have industry leading efficiencies and exceptionally quiet cutting edge fans. They also feature WRAS approved heat exchangers. WRAS is a conformance mark that demonstrates that an item complies to strict standards set out by UK water regulations.

The solution

Calorex air source heat pumps use dynamic renewable technology sourcing heat from every climatic condition and are available in different designs to suit space or hot water heating.

Unlike fossil fuel and direct electric heating systems, a Calorex heat pump is capable of delivering up to five times more energy than it consumes, and unlike solar and wind powered systems, Calorex heat pumps do not need the sun to shine or the wind to blow in order to provide this efficiency.

Heat pumps

Calorex hot water heat pumps are electro mechanical machines that extract energy from an air source and upgrade this energy to a usable form of heat that is rejected to a water system. With efficiencies of up to 500% – most of the energy that is provided is absorbed completely free of charge from ambient air around the heat pump.

Heat pumps are practical devices that can be used in a wide range of heating, cooling or dehumidification applications. Unquestionably an energy efficient product, unique in its ability to concentrate and supply more energy that it consumes, a heat pump is a real alternative to conventional heating systems.


Calorex heat pumps are simple to install, require little maintenance and alleviate the need for fuel storage tanks and flues that are normally associated with fossil fuel heating systems. Further, due to their unique ability to collect and enhance “free” heat from the air around them, they are kinder to the environment than traditional heating systems and exceptionally inexpensive to operate.

Pro-Pac heat pumps can be installed outside or in a plant room that has adjacent outside walls. Pro-Pac can be supplied with high speed axial fans.​ The Calorex 34 range are designed for outdoor or plant room installation and are provided with centrifugal fans as standard. A choice of fan external static pressure offers flexible installation and an ability for the units to provide cold air through a ducted system.

All products are supported by an in-house applications department and nationwide service network.

More information

Al Baleed Resort

Calorex supply hot water heat more

Case studies

Hot water case more


Product more

Pro-Pac Application guide

Hot water heat pump more

Technical guide

Pro-Pac 30|45|70|90|140 H|HY air water heat more

Associated products


General Enquiries

+44 (0)1621 856 611

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