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 Germany imported advanced design concept: a large area of ??wing heat exchanger configuration, fully guarantee efficient heat exchanger efficiency of up to 106%. Energy efficient, environmentally friendly: Bosch Comfort Condense household gas boiler using advanced condensing technology, recycling the heat of water vapor in the flue gas, reduce exhaust gas temperature at the same time greatly reduce harmful emissions. Ultra quiet operation: Bosch Comfort Condense condensing gas boiler into the pursuit of high quality of life of people to create all the details in line with the design of quiet operation, special silencer cover, matching silencer pad, is its quiet operation the basis of