Other heating spare parts

When discussing spare parts for the boiler, one immediately thinks of the circulator that allows the heating water to pass, previously depressurized by the expansion tank and secured by the 3 bar valve, or the heat exchanger of the boiler (gas, oil, or condensation).
There is also the 7 bar valve to counteract hydraulic pressure in the hot water piping, the hydraulic block, and the 3-way valve (or even 2-way or 4-way valve, for example) but also other unsuspected heating spare parts that are just as necessary.
Whether it’s a degummer for a circulator or a TC probe for a Riello boiler, without these boiler spare parts, the operation of the heating device risks deteriorating.
Regarding the sanitary exchanger or each safety probe (NTC heating, CTN sanitary, or even klixon type thermistor), you can find clips for boilers or specific screws for a lever valve or used as boiler adjustment screws.