We buy parts before we sell them. Every product line goes through the same steps before it becomes available to trade customers.
Our QC steps
- Sample – We order a sample from a shortlisted supplier.
- Visual inspection – Casting, finish, connectors, seals, wiring quality.
- Dimensional check – Threads, flanges, bores, gasket seats, cord thickness.
- OEM comparison – Side-by-side against the OEM reference we mean to replace.
- Test – Functional test where applicable (pressure hold, resistance curve, flow response, cycle test).
- Compatibility verification – Which boiler models the part actually fits and functions in.
- Documentation – Photos, measurements, test results, sources.
- Approval – Approved / rejected. Approved parts move to sourcing at scale.
Statuses per product line: SAMPLE / TESTING / APPROVED / REJECTED / ACTIVE / DISCONTINUED.
What we do not claim
We do not claim certification we cannot back up. Where a component has a mandatory certification requirement (for example safety-critical parts), we only publish it once that certification is in place.
What this means for you
Compatibility on a HeatSpares product page is either VERIFIED or HIGH CONFIDENCE. If we cannot back it up, we do not publish it as compatible. If a part in the field turns out not to fit, tell us – we correct the compatibility record and take responsibility per the returns and warranty policies.