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Hi and thanks for replying: I don't know if the pump is for secondary circulation. The pump is yellow (its says 'Qrundfos' and 'Selectric Bronze' on it) and is connected to the cylinder inlet via a T-juntion. The other leg of the T-junction comes from the Cold Water Combination Valve. The...

I have a megaflo system in an indirect configuration. It is about 8 years old and has never really produced piping hot water, however, in recent weeks the temperature of the water has become tepid at best. The system has not been serviced since commissioning 8 years ago and we do live in a...