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Continuous Flow Water Heaters

I am building a house this summer with radiant slab in the basement. I was wondering if any of you guys have had any experience with Rinnai continuous flow water heaters (model 2532 FFU to be exact). The idea of using one unit to heat domestic and slab with a fully modulating unit sounds good. I am concerned about all the controls and electronics involved with this unit. I would run an injection system to temper the radiant water. Would I be better to run a conventional cast iron boiler and a storage water heater or one of these heaters. Any imput would be appreciated. Could you please email me as I may not make it back to this site before it is erased. My email is [email protected] Thanks in advance. Mike
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