Both boilers have a casing 750 mm high, 400 mm wide and 347 mm deep, with a cover over the control panel and built-in timer.

To improve reliability, these boilers have an exercise program for the pump and 3-way valve. Self-diagnostics is built in, with a display for fault codes.

A built-in 24-hour timer and system bypass remove the need for extra electrical and plumbing work. They have a built-in frost protection and can be installed in compartments without ventilation.

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