Basin mixer or pillar taps? The basin decides it first, because pillar taps need two tap holes and a mono mixer needs one. This guide compares the Ideal Standard Calista pair and mixer on holes, waste and flow, explains the check valve rule for single-flow mixers, and works through a ten-room cost example. It also covers pressure, slotted wastes and the mistakes that cause call-backs, with prices and stock checked on 6 November 2026.
Hotel & HMO refurb
Electrics, bathrooms, hotel housekeeping and fire safety from a single supplier. BOMs by room type, UK compliance checklist.
Read the hotel refurb guide

