Exi-tite develops heat pump packaged system for potable hot water

Exi-tite hwg

HVAC equipment supplier Exi-tite has developed a self-contained potable hot water system using the latest heat pump technology with AI capabilities.

The packaged system can be installed as a permanent fixture or mobile ‘plug-in’ solution across various applications such as offices, hotels and student accommodation, with heating capacities ranging between 13kW and 240kW and low-GWP refrigerant options.

Prefabricated off-site, it is constructed on a structural framework and designed to be wheeled or crane lifted into position.

Managing Director of Exi-tite, Andrew Robinson, said: “Heat pumps are being used increasingly for space heating and potable hot water, but the feedback from consultants and M&E contractors has been that, when installed incorrectly, they became an expensive problem. We have managed to navigate around the majority of on-site issues and found a solution that provides peace of mind.”

LG VRF heat pumps provide modular capacity control and redundancy, and are inverter-driven with both latent and sensible load monitoring. Each Multi V i system is connected to a high-temperature hydro kit, capable of producing water temperatures up to 80°C and provide 100% heating capacity down to -7°C, reducing the increase in capital costs associated with oversizing equipment to accommodate typical losses.

Group Sales Director at Exi-tite, Mark Brown, said: “Our first packaged hot water system has just been delivered to a project in Leeds and has been designed to provide 100kW capacity split into four 25kW stages. We have provided a 1650-litre energy bank and can provide 1800 l/hr of usable potable water, raising from a mains cold supply to 60°C with a 7-minute recovery time of the energy bank.

“We chose LG Multi V i heat pumps because they offer an enhanced corrosion resistance coating and continuous heating operating without entering a complete defrost. This means that hot water production is always available, which is a significant requirement from our customers.”

The method of hot water generation differs from typical systems that store potable water. When storing water, pasteurisation is required as a legionella prevention method and this typically impacts the system's operating efficiency and requires additional control strategies. Because the packaged Exi-tite system heats cold mains water directly through a heat exchanger without storage, pasteurisation is unnecessary and the need for salt-based softeners is also eliminated.

The system is plug-and-play, arriving with its own localised control, but is also pre-wired for connection to a building management system and pre-piped with connections to the cold water main, hot water supply and optional circulation loop.

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