There are two types of hot water boilers: Firetube and watertube. The water tube type is used for highcapacities and pressures. In these type of boilers the temperature increase much faster than fire tube ones. The fire tubes include all the capacities and pressures ranges and are manufactured in two and three passes designs. The two passes or wet back firebox design, is used for low capacities, the three passes type with combustion chamber, is used for high capacities.
Hot water boilers are used in closed loops and so for radiators, unit heaters and air conditioners. These boilers produce hot water with a burner which is compatible with the capacity of the boiler.Accessories for hot water boilers are as followe:
- Return Hot Water Valve
- Drain Valve
- Submerged Acoustic Thermostat
- Thermometer, Manometer
- Safety Valve
- Control Panel