Short answer
Gas water heaters supply hot water in kitchens, hotels, gyms and offices, either as direct-fired storage units or continuous-flow (instantaneous) heaters. CHP units burn gas in an engine to generate electricity and recover the heat.
Water heaters
Storage heaters need an unvented safety kit where applicable, a correctly sized flue and annual servicing. Continuous-flow banks need gas supply sized for simultaneous full fire.
CHP
CHP units have high continuous gas demand and specific ventilation and exhaust requirements, and often need a booster or dedicated supply.
Figures are typical for UK natural gas. The current edition of the relevant IGEM standard and the manufacturer's instructions always take precedence on site.
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