Can I tile up to or use silicone sealant around the T80 Easi Fit unit?

No — the unit must be mounted onto the finished wall surface on top of the tiles, and you must never tile up to the unit or seal around any part of it using silicone sealer after fixing to the wall. Special care must also be taken not to block or seal any PRD vents on the unit. Deviating from this requirement may impair operation and invalidate the product warranty. (Pages 3, 7)