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DeltaT2
As a cheap nautral point in a system with several system heat sources they have there place. But that's about it!!
I think you meant neutral. UFH makers use them and they only use one heat source. I suggest you contact one of the makers and get them to give you the low-down on them. Nu-Heat have a stainless pressurized version. It does not need a plumber with a pressurized certificate to fit. They have not experienced any sludge in their thermal stores, even those with rad loops off them.
Listen WS, you're still peddling your same old p.sh, no self-respecting installer is going to install a sludge buckets, we've been installing UFH for 20 years and rarely use a TS or HB. They just fail or fill with sludge. As for a recommendation or specification I'd not quote these chancers at Nu-Heat, they're all used car salesmen & like you, full of sh.te!! Just get back into your bed fella & the nurse will be along with your medication very soon.