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Close Spaced Tees, on a Primary-Secondary radiant system

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bloombrewing
bloombrewing Member Posts: 5
in Radiant Heating
I have an existing system at my Customer that needs reworked. All the existing is 3/4", with a pump for the tankless water heater, and the 2nd. Pump is for one-zone/5-loop, radiant floor heat.
Is it "necessary" to upsize, to 1", the Primary loop, and then Close-Spaced tees that are to serve a 3/4" sized zone. Is the added expense needed to scrap all the 3/4" on the primary side and up-size it? Primary through the tankless heater is a high-head Taco multi-speed 0013-MSF1-IFC, and the secondary zone is a regular Taco 007-F5
Attached is NOT this system, but a Primary-Secondary, with closed spaced tees and a reduction of pipe size, on the Secondary loop.
Also in another post, I question pumping towards the compression tank, not away...

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