OSO Hotwater spares and replacement parts
OSO Hotwater is the world's largest maker of stainless steel unvented cylinders, including the Super S, Delta and Multipoint ranges. We stock genuine OSO parts, with compatible options on selected items, plus trade pricing and same-day dispatch on stock items.
What we stock, by part
- Immersion heaters from 2kW to 5.9kW, including Super S iQ, Delta MK1, Slimline and Nano versions, a titanium element and 480V marine heaters, plus box spanners for fitting.
- Thermostats: rod thermostats for Super S iQ and Delta immersion heaters, surface-mounted thermostats and the Delta MK1 case-mounted boiler thermostat.
- Valves: T&P relief valves, Sole 381 expansion valves, Multibloc inlet control valves, complete Super S valve assemblies (pre and post 2021), Sole 109 service kits and a Honeywell motorised valve.
- Expansion vessels from 2 to 100 litres (UKAX series), with braided hoses.
- Tundishes, kits and fittings: direct and indirect accessory kits, angled tundishes, drain cocks, sensor pockets, adaptors, top lids and cable strain reliefs.
Finding the right part
Check the rating plate for your cylinder range and model, and whether it is direct or indirect, as thermostats and kits differ between ranges. Super S valve assemblies changed in 2021, so check your cylinder's age. Relief and expansion valves must match your cylinder's rating and should be fitted by a G3-qualified installer. If you are unsure, use the parts finder or our Can't Identify Your Spare Part? service.
Looking for a complete unit instead? See the full OSO Hotwater range, or find matching valves in our Reliance parts. If the part you need is not listed, call us on 01934 253600 and we can usually source it.
