Reliance Spare Parts
Electrical Deals Direct supplies genuine and compatible Reliance RWC spare parts, including pressure relief valves, pressure reducing valves, temperature and pressure relief valves and inlet control groups. Order online with trade pricing, fast dispatch and expert phone support from a team who know pressure and water heating systems inside out.
About Reliance RWC Parts
Reliance RWC is a leading manufacturer of plumbing and heating valves, with its pressure control components fitted as original equipment across a wide range of water heaters and unvented cylinders, including Heatrae Sadia and Santon appliances. Because these valves protect against over-pressurisation and, on combined units, overheating too, they're safety-critical parts: the bar rating, connection size and valve type need to match the appliance exactly, and many are WRAS-approved for that reason.
Looking for the appliance these parts fit? Browse our Heatrae Sadia Parts and Santon Parts ranges, or the wider water heating category.
Common Reliance RWC Parts We Stock
- Pressure relief valves — Series 101, 102 and 107 valves in a range of bar ratings and connection sizes, protecting water heaters and cylinders from over-pressurisation
- Temperature & pressure (T&P) relief valves — combined safety valves such as the TPR15 and CPT15, which respond to both excess heat and excess pressure in one unit
- Pressure reducing valves — used in appliances such as Heatrae Multipoint and Hotflo water heaters to protect pipework and unvented systems from mains overpressure
- Expansion relief valves — including offset nut metal expansion valves for closed system and expansion vessel protection
- Inlet control groups — compact assemblies that regulate and direct incoming mains water to the appliance
- Pressure relief cartridges — replacement cartridges for servicing existing relief valve bodies without replacing the whole valve
How to Find the Right Reliance RWC Part
Reliance RWC parts are matched by bar rating, connection size and thread type, so start by checking the rating stamped on your existing valve (for example 6 bar, 8 bar or 10 bar) and the connection format — M x F, F x F, or BSP thread size such as 1/2" or 3/4". It also matters whether you need a straightforward pressure relief valve, a combined temperature and pressure unit, or a pressure reducing valve, as these aren't interchangeable. Because these are safety components, always match like-for-like against the part number or appliance manufacturer's specification. If you're not sure which part you need, use our Can't Identify Your Spare Part? service, or send our trade counter team the model number or a photo of the old component and we'll match it for you.
Why Buy Reliance RWC Parts from Electrical Deals Direct
- Trade pricing on all Reliance RWC parts, with account pricing available for regular buyers
- Same-day dispatch on in-stock parts ordered before cut-off
- Genuine Reliance RWC parts, plus compatible options on selected items where they offer better value
- Expert phone support to match the right valve or control group to your specific appliance
- Deep pressure system and unvented cylinder knowledge on hand, not just a parts list
Related Categories
Browse our Heatrae Sadia Parts, Santon Parts, OSO Parts, or all spares and accessories. Not sure what you need? Try our Product Advisor or browse the Advice Centre.
Reliance RWC Parts — Frequently Asked Questions
What's the difference between a pressure relief valve and a T&P relief valve?
A standard pressure relief valve responds only to excess pressure, while a temperature and pressure (T&P) relief valve responds to both excess heat and excess pressure in a single unit. Check which type your appliance originally used before ordering a replacement.
What bar rating do I need?
This is set by the appliance manufacturer, not by preference, so check the rating on your existing valve or the appliance's data plate and match it exactly — common ratings in our range include 3, 3.5, 6, 7, 8 and 10 bar.
Can I fit a Reliance pressure relief valve myself?
These are safety-critical components on pressurised and unvented systems, so fitting should be carried out by a competent, appropriately qualified installer, with the replacement matched like-for-like to the original specification.
Do you stock parts that fit Heatrae Sadia and Santon appliances?
Yes — Reliance RWC valves are widely used as original equipment across several water heater and cylinder brands, including Heatrae Sadia and Santon, so many of the parts here will suit those appliances. Confirm against your appliance's part number if you're unsure.
Are these genuine or compatible Reliance RWC parts?
We stock a mix of both — genuine Reliance RWC components alongside compatible alternatives on selected items, so you can filter by part origin and choose based on price and preference.
Not sure exactly which part you need? Use our parts finder to search by model. If you'd rather talk it through, call our team on 01934 253600 or use live chat and we'll help you get the right Reliance RWC spare first time.
From Splash Backs to Drip Plates to Air Filters, if it's not in the list, don't hesitate to call us on 01934 253600, or send an email over to [email protected]. We are confident that we can source your replacement part or accessory.
