re-routed UFH 18mm gypsum board help! tips!

[Colin3322]

Hi All !!

Pre-routed UFH 18mm gypsum board…made by Warmup ProWarm LoFlo

I'm planning to install underfloor heating in a new build….Has anyone used this system with tiles? How reliable was it, and what tips can you share?
My main questions are:

1. Screwing down the boards 800x600 Gypsum boards : The manufacturer says it's a floating system (edge jointed ie floating over subfloor), but I'd prefer to screw them down. Is this unnecessary overthinking, or could it create problems?
2. Uncoupling membrane: Warmup says to prime and tile directly, while NuHeat (a similar system) insists on an uncoupling membrane. Should I use one, or is skipping it worth the time and cost savings?

Any advice would be greatly appreciated! Thanks in advance!