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How do you prefer to pipe your buffer tank? I’m installing a buffer on a new system with some fin-tube zones and some radiant floor zones. I would love to use the Caleffi buffer tank and pipe it using four ports like a hydraulic separator (see page 34 of Idronics 15 on hydraulic separation). I want to have a plan B in place in case there
isn’t room in the budget for the Caleffi tank, so I’m looking at using an electric HW heater (as I’ve seen described here in the past).
So a standard 1” MPT fitting will seal okay in the heater element ports?
What do you do about the 3/4” connections if 3/4 is too small, , just increase pipe size as soon as you leave the tank? I’m thinking being at 3/4 for just an couple inches isn’t such a big deal at the flows involved here. It seems like using larger ports might preferred where water is entering the tank to keep velocities lower and avoid too much mixing.
Which connections are preferred? I was thinking of boiler supply into top element port, boiler return into low element port. Remove dip tube and use the hot and cold connection on top for two supplies. Not sure where returns would be.
Would anyone care to share some pictures?