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In the next week or so I I plan to start piping and installing a boiler that will be used to heat domestic hot water (tankless coil) and supply hot water for my infloor/ceiling radiant install I just finished in our new house. We are allowed to install boilers in our own homes. I have obtained code requirements for the state I live in(Maine).I have looked at the supplied piping diagrams that came with the boiler(Utica SW series) and piping diagrams that are in the back of the WIRSBO Complete Design Assistance Manual (4th Edition) What I am trying to do is pipe in a system that supplies water to two separate manifolds( manifold A supplies heat to the 2nd floor ceiling radiant zones, each one of these zones is controlled by a separate zone valve/thermostat) Max temp. is estimated to be 110 degrees supply. Manifold B supplies 5 zones for the 1st floor floor heating (each zone is conrolled by a separate zone valve/thermostat) I think I need to run a separate circulator for each manifold with a 3 way mixing valve for both manifolds to regulate supply temp. for these manifolds. I'm under the impression that this mixing valve(s) will help protect the boiler from to low return temps. Or I think I need to run a bypass loop for total protection of the boiler. The diagram that I guess shows what I am(or think) wanting to do is page 157 of the WIRSBO book or LEVEL II control non condensing boiler/3way tempering valve/dual temperature RFH If anyone has any ideas or piping schematics they'd like to share I'd love to see them Joey