Cotherm Parts
Electrical Deals Direct supplies genuine Cotherm spares and replacement parts, including dual thermostats, immersion heater thermostats, capillary thermostats and Incoloy and titanium immersion heaters. Order online with trade pricing, fast dispatch and expert phone support from a team who know hot water cylinders and immersion heating inside out.
About Cotherm Parts
Cotherm is an industrial group founded in 1948 in Grenoble, France, specialising in thermostats, safety limiters and heating elements for water heaters, HVAC systems and food service equipment. Its thermostats and elements are fitted as original equipment across many electric water heating products, so they're a common replacement when a cylinder stops heating, overheats or holds an inconsistent temperature. Because thermostats and safety cut-outs control temperature and protect against overheating, replacing them with the correct part for your heater matters as much as getting the element length right.
Looking for other cylinder spares? Browse our Tesla Parts, Heatrae Sadia Parts and OSO Parts ranges.
Common Cotherm Parts We Stock
- Dual thermostats — TSR, TSE and TS Prime dual thermostats for 11 inch immersion heaters, combining temperature control with a manual reset safety cut-out in one unit
- Immersion heater thermostats — 11 inch thermostats including the 20A TSDH1107 and the TSD01105, plus TSR and TSE replacement thermostats
- Adjustable thermostats — the TSR adjustable thermostat in white and blue, for setting the water temperature on the immersion heater
- Capillary thermostats — GTLHR070 and GTLH3161 capillary thermostats for remote temperature sensing
- Incoloy immersion heaters — 3kW Incoloy elements with a 1¾" thread in 11 inch and 14 inch lengths, supplied with a TSE or TS Prime thermostat
- Titanium immersion heaters — 14 inch 3kW titanium element with a 1¾" BSP thread, for areas where corrosion resistance matters most
How to Find the Right Cotherm Part
Cotherm parts are matched by thermostat type, immersion heater length and thread size, so start by checking the length of your existing element (11 or 14 inch) and the boss thread (1¾" on the heaters here), then match the thermostat code stamped on your current unit, such as TSR, TSE or TS Prime. Dual thermostats include the manual reset safety cut-out, so confirm whether your heater needs a single or dual unit before ordering. 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 Cotherm Parts from Electrical Deals Direct
- Trade pricing on all Cotherm parts, with account pricing available for regular buyers
- Same-day dispatch on in-stock parts ordered before cut-off
- Genuine Cotherm parts sourced directly from the manufacturer, not aftermarket substitutes
- Expert phone support to match the right thermostat or element to your specific heater
- Deep hot water cylinder knowledge on hand, not just a parts list
Related Categories
Browse our Tesla Parts, Heatrae Sadia Parts, OSO Parts, or all spares and accessories. Not sure what you need? Try our Product Advisor or browse the Advice Centre.
Cotherm Parts — Frequently Asked Questions
What's the difference between a dual thermostat and a standard thermostat?
A dual thermostat combines the temperature control with a manual reset safety cut-out in one unit, so it also protects against overheating. A standard immersion heater thermostat handles temperature control only.
How do I know which Cotherm thermostat I need?
Check the code on your existing thermostat (for example TSR, TSE or TS Prime) and the length of your immersion heater, then match both. If you're unsure, send us the details and we'll confirm the correct part.
Should I choose an Incoloy or titanium immersion heater?
Incoloy elements suit most installations, while titanium is a good choice in areas with hard water, where scale and corrosion shorten element life. Check your local water hardness if you're unsure which to fit.
Are these genuine Cotherm parts?
Yes — the Cotherm spares we stock are genuine manufacturer parts, so they match the fit and performance of the original component.
Can I replace an immersion heater thermostat myself?
Immersion heater thermostats are electrical components connected to mains power, so replacement should be carried out by a competent person, with the power isolated and the cylinder checked afterwards.
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 Cotherm 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.
