pros: burns clean and heats evenly. If the electricity goes out, you can still heat with gas. Compared to an electric heater attached to a gas-burning electric power station, a natural gas heater uses less fuel and puts less CO2 in the air.
cons: cost a fortune now a days.
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There is a proviso there. A power-cut will prevent most gas-fired central-heating boilers to cut out, or not light at all, by denying electricity to their internal fans and control electronics; and of course the the circulating pumps would stop too.
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