A condensate neutralizer device for treating a condensate flow, the condensate neutralizer device includes a compartment adapted to receive condensate neutralizing materials therein, the compartment having an inlet end and an outlet end, a plurality of apertures disposed only on a bottom surface of each of the inlet end and the outlet end of the compartment. The compartment is configured to receive the condensate flow traversing upwardly through the plurality of apertures at the inlet end in a direction from the inlet end to the outlet end through the condensate neutralizing materials before allowing a treated flow of the condensate flow to traverse downwardly through the plurality of apertures at the outlet end to exit the compartment as an effluent.

A gas-fired steam boiler, including multiple heat exchange tubes, an upper steam header, a lower steam header, a casing, a burner, a condenser, a chimney, and a controller. The heat exchange tubes are vertically arranged to form an annular tube row. A space enclosed by the annular tube row is configured as a furnace. Adjacent two heat exchange tubes are combined to form a gap channel evenly distributed along a circumferential direction. A width of the gap channel is 0.1-4 mm, and a circumferential length of the gap channel is 50-300 mm. A length of the gap channel along an axial direction of the heat exchange tube is the same as a length of the heat exchange tube.

A gas-fired steam-injection boiler has a flue and a water supply pipeline. The flue is provided with a radiation section and a convection section. The water supply pipeline has, in the flue gas flow direction, a first pipe section located at an upstream portion of the convection section, a second pipe section is located at a downstream portion of the convection section, and a third pipe section arranged between the first pipe section and the second pipe section. In a water flow direction of the water supply pipeline, the second pipe section, the first pipe section and the third pipe section are arranged in sequence. By using a flue gas condenser, the temperature of flue gas can be further reduced, and the latent heat of vaporization of steam in the flue gas is absorbed to form condensate water.

A housing includes a back plate portion, a pair of side plate portions which extend forward from both side ends of the back plate portion, and a front opening. A chamber is arranged inside the housing and includes a first attachment surface 31ba inclined with respect to the back plate portion in a plan view and an intake port which opens forward in the first attachment surface. A fan includes a second attachment surface provided with an emission port and is attached to the chamber in a state in which the second attachment surface is opposed to the first attachment surface to communicate the emission port with the intake port of the chamber.

A water heater includes a vessel (20) provided with a burner (3) having a downward combustion surface, a fan casing (10) accommodating a fan (10a) for supplying a mixture gas of primary combustion air and fuel gas to the burner, an annular packing connecting a first connection end surface at a downstream end of a first passage forming a downstream-side passage of the fan casing with a second connection end surface at an upstream end of a second passage forming an upstream-side passage of the vessel in airtight state, and a check valve (5) disposed near the upstream end in the second passage (2).

A condensate neutralizer system for treating condensate of a condensate generating device, the condensate neutralizer system including a container having an inlet and an outlet, the inlet is configured to receive condensate from the condensate generating device, the container is configured to contain a condensate neutralizing material useful for treating the condensate and the outlet is configured to drain condensate treated with the condensate neutralizing material; a controller; and a pH meter functionally connected to said controller, the pH meter is configured to take pH measurements of the treated condensate, the measurements are configured to be compared to a fault pattern, wherein the fault pattern is defined by a condition where the pH measurements are lower than a pre-determined pH level and if a fault is determined to exist, a warning is raised or a delivery of replenishment of the condensate neutralizing material is initiated.

A drainage water discharge pipe is connected to a secondary heat exchanger for discharging drainage water to the outside of the secondary heat exchanger. An air passage pipe is connected to an exhaust box. A three-way pipe joint allows merging of a flow path on a side of the drainage water discharge pipe and a flow path on a side of the air passage pipe, and allows connection of the merged flow path to a drainage water tank connection pipe. In the three-way pipe joint, the flow path on the side of the air passage pipe is greater in diameter than the flow path on the side of the drainage water discharge pipe, and the flow path on the side of the drainage water tank connection pipe is decreased in diameter after merging of the drainage water discharge pipe and the air passage pipe.

A profile of piping, particularly for making a heat exchanger for a condensation boiler. The cross-section of the profile has a trapezoidal portion with two bases and two sides, and a triangular portion with a base and two sides. A first side of the trapezoidal portion coincides with the base of the triangular portion. The second side and the bases of the trapezoidal portion and the sides of the triangular portion form the inner walls of the profile. A first angle between the first base of the trapezoidal portion and the first side of the triangular portion adjacent thereto is 45?-135?, preferably 90?. A second angle between the second base of the trapezoidal portion and the second side of the triangular portion adjacent thereto is 180?-270?, preferably 225?. A coiled heat exchanger for condensation boilers providing said profile and a condensation boiler providing said heat exchanger are provided.

A condensate neutralizer having cap adapters is provided. The condensate neutralizer includes a captive pipe, a first cap adapter and a second cap adapter. Each of the cap adapters includes a base, a lock ring and a cap. The base includes a bottom portion secured to the captive pipe and a top portion forming a base opening. The lock ring forms a lock ring opening and releasably attaches to the top portion of the base. The cap includes a plate and an inlet protruding from the plate. The inlet is connectable to a pipe. The plate includes a diameter larger than the base opening and the lock ring opening and is disposed in between the base and the lock ring.

An exhaust gas latent-heat recovery device includes: a heat transfer tube disposed inside a duct through which exhaust gas flows, the heat transfer tube having a water supply inlet into which water to be heated for recovering latent heat of the exhaust gas is supplied and a water supply outlet through which the water to be heated is discharged; and a water supply control part configured to control supply of the water to be heated to the water supply inlet. The water supply control part is configured to control supply of the water to be heated from the water supply inlet so that an outlet temperature being a temperature of the water to be heated at the water supply outlet is at a set temperature.