Hi all - we're renovating a 1970's bungalow that we've installed a new slab (PIR 150mm insulation + liquid screed) within which we've run UFH. In total we've got 10 loops split into 7 zones with approximately 75L of water in the system and a heating demand of about 7.5kw according to the Wunda calculations.
Currently we have the 24kw Worcester Bosch Greenstar 24i gas boiler directly connected to the UFH manifold. Having been reading various threads on here with interest it seems the suggested setup is to have a buffer tank to feed the UFH manifold to reduce short cycling of the boiler. GIven our system requirements what sort of size buffer would be recomended? I'm guessing 50L would be too low and we should be looking at 75-100L? Unfortunately we've got a short space of time to (easily) resolve this before plasterboard goes up everywhere, as ideally we'd mount any additional tank in the loft (where the boiler + 180L UVC are located).
Does anyone have any links to a simple diagram/spec I can give to our plumber so he can understand what I'm asking for (and how it differs to the current basic setup), and any suggestions for (preferably compact/wall mountable) buffer tanks (and expansion tanks?) that I could use for this?