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Industrial hot water boiler application and required process result; Water temperature and heat demand: Specify supply and return conditions, required heat output, seasonal variation, minimum circulation and operating pressure. Identify whether process water is separated by an exchanger.; Hydraulic and combustion design: Compare flow resistance, circulation protection, burner operation, controls and flue temperature. Check return-temperature restrictions and the intended method of condensation or corrosion protection.; Representative input variation and difficult production cases; Required acceptance evidence: Demonstrate the agreed water temperatures and heat balance over representative loads. Record flow, pressure drop, fuel conditions and cycling behaviour, including loss-of-flow protection.; Site and utility scope: Prepare circulation pumps, expansion and pressure protection, water treatment, combustion air, exhaust routing and service clearances.; Service provision: Maintain burner settings, water chemistry, heat-transfer surfaces, circulation protection and control sensors; record operating trends before fouling becomes a production constraint.; OEM/ODM engineering scope: OEM control interfaces and connections can be reviewed; ODM temperature, pressure or fuel changes need thermal, hydraulic and pressure-system validation.; Upstream preparation and downstream handling interfaces; Destination country and applicable installation requirements; Production schedule, changeover mix and operator availability; Drawings, samples, inspection method and rejected-output criteria.