A vertical tube boiler having a plurality of vertical tubes which extend through a water tank and communicate with a combustion chamber and a chamber provided with a flue outlet, the tank being provided with a transverse plate located above the bottom or firing plate of the tank and provided with holes 20 through which the tubes extend with a clearance gap being provided between the periphery of each hole 20 and the outside of the associated tube, through which gaps water flows upwardly to create upward currents in the water within the tank to hold any scale removed from the outside of the tubes in suspension and if such scale drops to the bottom of the tank, then it accumulates on the plate and not on the firing plate thus preventing burning out of the firing plate.
A water heater apparatus is shown which includes a water heating tank having generally cylindrical sidewalls with upper and lower ends, each of which is closed by a transverse wall section to define a closed tank interior. The tank also has a water inlet and a water outlet. A plurality of vertically arranged fire tubes are connected between the upper and lower transverse wall sections, each fire tube having an open interior for conducting products of combustion. A combustion chamber is mounted on the upper end of the water heating tank for providing products of combustion to the open interiors of the fire tubes. A flue collector is located at the bottom end of the tank for collecting and exhausting the products of combustion from the vertically arranged fire tubes. An induction blower draws the products of combustion downwardly from the combustion chamber, through the fire tubes and out the flue collector for exhaustion from the apparatus. A specially designed burner operates at lower pressure conditions and provides a low capacity airflow to the unit when the main induction blower is off to create a static condition and prevent condensation within the internal components of the apparatus.
A hot water heater for generating substantial instantaneous hot water by positioning a plurality of burners adjacent one end of a heat transfer section. The heat transfer section includes an elongated housing which has a plurality of tubes carried therein. Water is circulated through the elongated housing for being heated by the products of combustion being generated by the burners being drawn within the elongated tubes by means of a vacuum. A combustion chamber in which the burners are carried is frusto-conical in shape with the large diameter end being exposed to the atmosphere and the small diameter end being in communication with the heat transfer section.
