DIFF and DIFF-ISOTHERM® spare parts
DIFF and DIFF Isotherm parts are an alternative option for after-sales service on heating appliances such as boilers, water heaters and burners. Drawing on our market expertise and understanding of heating professionals’ expectations, we carry spare parts of equivalent quality to the brands you generally choose for repairs.
Genuine parts with DIFF® packaging
A genuine part, in this case in packaging marked DIFF, may in reality be produced using components from multiple manufacturers. Whatever the case, it must conform to the specifications of the heating appliance manufacturer and assembler.
What is a DIFF® Packaging part?
- Specific DIFF packaging
- A different product label
- A Diff® punch mark
- Compliance with instructions in manufacturers' specifications
- In some cases, a different colour or appearance, subject to compliance with the manufacturers' specifications
- Diff parts installed in more than 20 million systems
Regarding the "genuine part” description, the brand of spare part is as advertised.
The term genuine part is applicable because the product is associated with the part manufacturer, not the brand of heating appliance in which it is used.
With DIFF parts, warranty cover is provided by the part manufacturer, and use of such parts cannot legally give rise to a warranty exclusion by heating appliance manufacturers.
DIFF - Isotherm®: generic parts
Generic parts with the Isotherm® label
Our generic parts must be of similar quality to genuine parts supplied by manufacturers.
Isotherm® designs, tests and manufactures its own spare parts, guaranteeing their interchangeability, quality and technical performance, just like genuine parts from the manufacturer.
What do you get with Isotherm® parts?
- A spare part bearing the Isotherm® label
- Isotherm® part mentioned on the DIFF packaging
- BENEFIT: Term indicating that the part provides added value compared with genuine parts, without compromising on the required durability and quality
- PARTICULARITY: Information about the appearance (colour, shape, etc.) or other specificity (e.g. an extra gasket) with no impact on component interchangeability
Each generic part is guaranteed directly by Isotherm®. Use of Isotherm® parts cannot legally give rise to a warranty exclusion by boiler manufacturers.
The particularity is indicated both in our catalogue (via a symbol) and on the label of Isotherm® generic heating system parts. 
All our spare parts are made mainly with genuine components and generic components.
How are DIFF parts developed?
Choose DIFF and DIFF Isotherm® spare parts for long-lasting, high quality after-sales service and maintenance.
Our spare parts are suitable for large international companies and independent heating repair contractors alike, at equally attractive rates for all. In addition, all our spare parts are developed in France.
Because they are fully interchangeable with the part fitted in the appliance, DIFF spare parts use cross-referenced product codes to quickly identify which part to choose for a particular application.
DIFF parts are developed considering four criteria:
- Feasibility
- Design
- Industrialisation
- Production
R&D-focussed projects
Our experience with spare parts allows us to target heavily used parts, identify any weaknesses and supply optimized products Harnessing our experience in HVAC and spare parts development, and aided by our strong customer relationships, we can identify weaknesses in heating appliance spares and offer an improved generic equivalent. Are certain three-way valves prone to leaks? No problem, DIFF Iso spares deliver the added benefit of strengthening the weak spot.
All our products are designed to be compatible, rugged and long-lasting, drawing on our multidisciplinary expertise in:
- Metal pressing and machining (brass, aluminium, stainless steel and Zamak)
- Plastic and rubber injection moulding
- Thermal insulation cutting and machining
- Metal stamping and laser cutting
All DIFF isotherm® parts are tested at our laboratory, in boilers and other relevant appliances, at every stage of development.
This ensures that DIFF generic spare parts offer the endurance and service life expected in such appliances. Individual leaktightness tests are performed as part of the production process.
