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Galmet 500 biwal indirect water heater, two-coil heat exchanger, polyurethane insulation
The Galmet 500 biwal indirect water heater is a vertical tank-type unit designed for domestic hot water production. It features a two-coil (biwal) heat exchanger arrangement that allows connection to two independent heat sources, such as a boiler and a solar thermal system. Polyurethane insulation reduces standby losses and helps maintain stored water temperature for reliable daily use in homes and small buildings.
The two-coil design enables simultaneous integration of two heat sources, improving system flexibility and enabling prioritized or complementary heating strategies. Polyurethane insulation provides effective thermal retention while the vertical tower configuration minimises floor footprint. The construction is intended for stable, efficient heat transfer and straightforward connection to standard domestic plumbing and heating systems.
Connect the primary circuit(s) to the respective coils following installer instructions and local plumbing codes. The boiler or alternative heat source circulates through one coil while the secondary source, for example solar thermal, circulates through the other. Control and mixing valves should be used as appropriate to maintain desired delivery temperature and to prevent scalding. Regular commissioning by a qualified technician ensures correct flow rates, safe pressure settings and effective integration with existing heating equipment.
To maximise performance, insulate external piping, install appropriate safety and expansion components, and schedule periodic inspections for sediment removal and heat exchanger condition. Use a qualified installer to set up the dual-coil connections and control strategy suitable for your boiler and solar systems.
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