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Define the intended role
Explain whether the appliance is supplementary or intended to contribute substantially to heating. A specialist should assess heat demand and interaction with existing equipment.
Coordinate the system design
Hydraulic connections, controls and safety provisions depend on the appliance and installation. Do not assume an existing fireplace or boiler arrangement can be connected without redesign.
Compare full costs and responsibilities
Include equipment, specialist installation, commissioning and maintenance. Ask for operating limitations and current efficiency assumptions rather than relying on historic savings percentages.