Minneapolis does in fact require double-wall HX when potable water is connected to any closed system or non-potable heat transfer fluid. This is true in every part of Minnesota until we adopt the UPC sometime this spring.
Some factions tried to end-run the new code and require an RPZ at the meter to "protect" others from the "irresponsible" use of single-wall HX. I presented the arguments for single-wall and won so we will be a free-state for single wall indirects and plates next year.
Morning Bob,
Minneapolis does in fact require double-wall HX when potable water is connected to any closed system or non-potable heat transfer fluid. This is true in every part of Minnesota until we adopt the UPC sometime this spring.
Some factions tried to end-run the new code and require an RPZ at the meter to "protect" others from the "irresponsible" use of single-wall HX. I presented the arguments for single-wall and won so we will be a free-state for single wall indirects and plates next year.