GALAXIA is a generator with dry chamber. This means that the furnace is spared from the side in touch with water, by the use of special angled profiles that comes to high temperature in short time the combu¬stion smoke avoid condensation even with low water temperature. GALAXIA is equipped with a kettle for production of sanitized hot water, directly immerse in boiler body, this take advantages like limited dimensions, easy installation operations (pump for kettle charge is not necessary), limited external surface that means minimal thermical dispersions.