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Low Loss Header


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Posted by PS on May 20, 2005 at 09:07:51:

Replacing old gas boiler with Vitodens 200 and IDWH. System is forced hot water, single-pipe diverter tee with split loop (single heating zone)to standing CI rads (~ 60kBTU/h radiator capacity - well matched to design day loss), existing circ is on return. New system will use OA reset, DHW priority, constant circulation, pumping away.
My dilemma is 2 quotes - one proposes using a low loss header with separate circs for heating and DHW, second one proposes straight piping to boiler and only utilizing integrated pump and solenoid valve(6-24 or 8-32). Which approach is best? Not really sure of the P/S or LLH applicability for my system. FYI - Both pros are highly recommended and Viessmann reps, but neither pro measured piping or looked at existing circ pump (heating only).


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