A mixer shower is the right answer in almost every London property that runs from a combi boiler or an unvented mains-pressure cylinder. The valve blends pre-heated hot and cold supplies through a thermostatic cartridge, holds a stable 38C set-point, and shuts down automatically if either supply fails, which removes the scalding risk that older manual mixers carried. Installation is straightforward only on paper. In practice the supply pressures need to be balanced within 10 per cent, the pipework geometry has to match the valve back-plate exactly, and the wall recess for a concealed valve has to be cut to the manufacturer's plaster-depth window or the trim plate will not seat flush against the tile.
We install Aqualisa Visage, Mira Mode, Bristan Artisan, Hansgrohe Ecostat, and Grohe Grohtherm thermostatic mixer showers as standard, and we will install any other WRAS-approved manufacturer of your choosing. Every install includes a balanced-pressure check at the inlets, isolation valves on both supplies behind the access panel, the manufacturer's recommended copper or push-fit pipework geometry, a soldered or compression connection to the body, a pressure test under operating load, and full calibration with a digital thermometer at the head. Tile-face sealing is done with a low-modulus neutral-cure silicone so the wall plate does not stain the grout over time. If your existing shower has simply lost pressure or temperature control, a shower repair is often the quicker fix.
Where this service applies
- First-time installation of a thermostatic bar mixer onto an existing bath or shower enclosure
- Replacement of an outgoing electric shower with a mixer running from the combi or unvented cylinder
- Concealed valve installation behind tile, with chase-out for hot, cold, and outlet pipework
- Exposed bar-mixer installation onto existing 15mm copper tails standing proud of the tile face
- Dual-outlet installation with overhead rose and handset on a slide-rail
- Upgrade from a manual mixer to a thermostatic valve to bring the suite up to current safe-temperature guidance
- Bath-shower mixer installation with diverter spout for combined bath and shower use
- New-build or refurbishment installation onto first-fix copper or push-fit pipework
- Replacement of a discontinued mixer valve where parts are no longer available
How we deliver
No surprises, no upselling. The exact path every job follows.
- 1
Pre-install survey
We check supply type (combi, unvented mains, gravity), measure hot and cold pressures and flow, and confirm the valve specified is rated for the property. Most mid-range thermostatic mixers need a minimum 1 bar dynamic, and we verify before fitting. - 2
Isolation and removal
Hot and cold supplies isolated at service valves or the stop-tap, system drained at the lowest outlet, and any outgoing valve removed cleanly. Pipework ends are inspected, cut back to clean copper, and prepared for new joints. - 3
Pipework geometry set out
For a concealed valve we set the inlet centres to the manufacturer's spec (typically 150mm on a bar mixer) and confirm the body sits within the plaster-depth window so the trim plate seats flush. - 4
Valve body installed
15mm copper or WRAS-approved push-fit connections made up to the body with the manufacturer's filter washers fitted on the inlets. Isolation valves left accessible behind the panel for future service. - 5
Pressure test before tile-up
Supplies recommissioned, system run under live pressure for a minimum 15-minute hold, and every joint checked for weep before any tile-face dressing is fitted. This is the only chance to find a fault before it disappears behind the wall. - 6
Trim, rose, and handset fitted
Wall plate sealed to tile with low-modulus neutral-cure silicone, fixed head or slide-rail installed plumb to spirit level, and the handset hose fitted with the brass weight or check-valve where the unit calls for one. - 7
Calibration and handover
Thermostatic valve calibrated to a 38C set-point with a digital thermometer at the head, upper limit-stop verified, and the warranty registration card filled out so the manufacturer cover starts cleanly from day one.