low loss headers

[cvap]

While everyone is helping me with my softener issues, I thought I'd ask about another problem I have with a header installed by a local plumber. It feeds two loops, one to floor heat, and one to a Flat Plate exchanger for a 2500 gallon spa. Both work fine alone , but when both are calling for heat the spa temp drops right off. I can correct it with the floor heats mixing valve but then have to change it back or the floor water gets too hot when the spa is not on. Has anyone ever used pre made header/manifold combinations? Or is there something else I can do? I saw this Calleffi 509 and it will fit in the tight space I have.

 

[Tom Sawyer]

Put the spa zone on priority.

 

[Sponsor]

 

[cvap]

Does putting it on priority mean the floor heat won't run when the spa is on? If so, that kinda defeats the purpose of installing a larger boiler. I also have a big towel warmer on the floor loop. The primary pump was an after thought because I complained of this problem. At first, the secondary loop pumps were the only thing that would push water through the boiler. I hate to call someone else and ask them fix another person's problem.