Water heater combines solar thermal and gas

Hamworthy Heating, solar thermal, hot water, DHW

Hamworthy Heating’s DR-TC water heater combines solar-thermal technology and a condensing gas-fired support. Two models provide outputs of 40 or 60 kW, and they are supplied with a matching solar-transfer station. Trigon solar collectors fit perfectly with the system.

These units fit into a square metre of floor and sidestep the need for an auxiliary heater.

They are based around the Dorchester DR-EC Evo water-heater concept, with an efficient down-firing condensing burner and coiled heat exchanger — but with the addition of a dedicated solar coil for a solar circuit.

The system prioritises the use of solar energy, but will change to gas-fired operation as a high-efficiency back-up when there is not sufficient solar energy to meet demand and to aid with the anti-legionella purge.

Hamworthy can take clients through the whole design and installation process, including commissioning, which is important to set up the system accurately — for example setting the solar temperature differential and hysteresis to ensure the most efficient operation for a particular installation and demand cycle.

For more information on this story, click here: Nov 2012, 174
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