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Bristan Onza Rear-Fed Exposed Black Thermostatic Shower Valve with Riser Kit
Bristan

Bristan Onza Rear-Fed Exposed Black Thermostatic Shower Valve with Riser Kit (837AJ)

Delivery available to mainland GB only, (offshore and Northern Ireland is not available). Order by 3pm for next working day delivery. Orders placed after 3pm will be delivered within 2 working days.

The Bristan Onza rear-fed exposed thermostatic shower valve in black provides steady performance for high-pressure water systems. It delivers 7.6L/min at 1 bar through a single-spray round handset and maintains stable temperatures with thermostatic control and automatic water failure shutdown. Sequential control offers straightforward adjustment, while the 95mm shower head and riser rail give practical positioning for everyday use. The unit operates between 1 and 5 bar, with a maximum temperature of 60°C, supporting reliable hot-water management in modern bathrooms. A rub-clean nozzle design helps reduce limescale build-up, and the easy-fit system supports efficient installation. Designed to complement square and round bathroom fittings.

  • Suitable for High Pressure Water Systems Only
  • Delivers 7.6Ltr/min at 1bar
  • Sequential Control
  • 1 Year Guarantee
  • Thermostatic Temperature Control
  • Riser Rail
  • Single-Spray Pattern Shower Head
  • Family Safe
  • EasyFit Installation
  • Rub-Clean Nozzles
More Info

View all: Bristan Showers

£279.00Inc Vat
Delivered by our approved supplier | Find out more
Fulfilment options

The Bristan Onza rear-fed exposed thermostatic shower valve in black provides steady performance for high-pressure water systems. It delivers 7.6L/min at 1 bar through a single-spray round handset and maintains stable temperatures with thermostatic control and automatic water failure shutdown. Sequential control offers straightforward adjustment, while the 95mm shower head and riser rail give practical positioning for everyday use. The unit operates between 1 and 5 bar, with a maximum temperature of 60°C, supporting reliable hot-water management in modern bathrooms. A rub-clean nozzle design helps reduce limescale build-up, and the easy-fit system supports efficient installation. Designed to complement square and round bathroom fittings.

  • Suitable for High Pressure Water Systems Only
  • Delivers 7.6Ltr/min at 1bar
  • Sequential Control
  • 1 Year Guarantee
  • Thermostatic Temperature Control
  • Riser Rail
  • Single-Spray Pattern Shower Head
  • Family Safe
  • EasyFit Installation
  • Rub-Clean Nozzles
More Info

View all: Bristan Showers

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Specification
BrandBristan
Built In Valve/ExposedExposed
ColourBlack
Fixings SuppliedFixings Supplied
Manufacturer Guarantee1 Year Guarantee
Max Water Temperature60 °C
Max. Shower Flow Rate8.8 Ltr/min
Maximum Bar Pressure5 bar
Min. Shower Flow Rate7.6 Ltr/min
Minimum Bar Pressure1 bar
Mixer TypeThermostatic
Model NameOnza
Model NoNZA SHXAR BLK
No. of OutletsSingle Outlet
Pack Size1
Parent ColourBlack
Pieces in Pack/Case1
Pipe Centres Size/Range110-155 mm
Product Depth90 mm
Product Height650 mm
Product TypeShower Valve with Riser Kit
Product Width175 mm
Shower Head ShapeRound
Shower Head Size95 mm
Shower Product TypeMixer
Smart CompatibilityNot Smart
Temperature Control TypeThermostatic Temperature Control
Total Product Weight2.55 kg
Water Failure ShutdownAutomatic Water Failure Shutdown
z1 - UK Manufacturer NameBristan Group Ltd
z2 - UK Manufacturer Postal AddressBirch Coppice Business Park, Dordon, Tamworth, B78 1SG
z3 - UK Manufacturer Electronic Addressenquire@bristan.com
z4 - EU Manufacturer NameMasco Europe S.a.r.l.
z5 - EU Manufacturer Postal Address14 Rue Strachen, Mensdorf, 6933, Luxembourg
z6 - EU Manufacturer Electronic Addressenquire@bristan.com

Product Contents

Shower valve, plated elbows (2), handset, riser rail with brackets, hose retainer, plated shrouds (2), black filters (2), 1.5m hose and fixings.

Delivered direct from our suppliers in the number of working days stated on the delivery button

Direct from our supplier delivery restrictions

Geographic restrictions apply, check your postcode below to see if any apply to you. For some locations delivery may take longer than the specified delivery time, and we can not currently offer delivery to offshore addresses.

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Returns

Please note - If you wish to return this item you will need to call us on our freephone number 03330 112 112 to arrange a free collection.

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