Do all cast iron boiler installations require bypass protection?
No, there are rules to follow. The basic rules as use boiler protection if one of the following occurs. If none of the following exists the installation would not require a boiler bypass. 1. When there is any amount of radiant floor heating or floor warming in the system. 2. When the system is a large water volume system. This would be a system with cast iron radiation. 3. When the amount of radiation in the system exceeds the DOE output of the boiler. This would be most jobs where the boiler was sized with a heat loss. The exception to this rule would be if it were a low water volume system (copper tube baseboard) which would be zoned and no one zone has more output than the boiler DOE Output. 4. There is a zone of snow melt on the system 5. Anywhere low return water temperatures are expected for an extended period of time.
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