1. What kind of steel Rakoczy boilers are made?

Inner jacket of the heat exchanger, which has direct contact with the fire and flue gases is made of sheet metal design S235JR + N with a thickness of 6 mm. Four millimeters thick has the outer jacket of heat exchanger.

2. What are the main differences between the boiler with upper and lower combustion?

The chamber boiler with upper combustion from the outside may look the same as the lower combustion boiler. Substantially difference is internal structure of the heat exchanger. The main selection criterion is the type of fuel which boiler is used. Upper fired boiler is suitable for any type of solid fuel, which is its great advantage, but has lower efficiency in comparison with the lower combustion. Lower combustion boilers are dedicated to a single type of fuel, mostly coal.  

5. Are there any changes necessary in the system when replacing an old boiler with upper combustion on boiler with lower combustion?

Generally, there is no need to make changes in the C.H. installation system. If your old boiler with upper combustion installation worked properly also modern lower combustion boilers should work in the same conditions. However, attention should be paid to the condition of the chimney, because more complicated design of the heat exchanger lower combustion boiler requires proper chimney draft.

6. What affects on solid fuel boilers work?

Work of solid fuel boiler is affected by several factors. These include:
- The quality and type of the fuel (its calorific)
- Thermal power of the boiler during operation
- Size of an installation (Number and size of the radiators, buffer tank ...)
- Outside temperature

7. Why the boiler does not reach the set temperature?

There are several reasons for this problem. These include:
-stucked flue gas exit,
-occlusion or no fresh air supply channel in the boiler room
-improper fuel (low calorific value)
-boiler is too small in relation to the heating requirements

8. What is the cause of "bubbling" in the chamber boiler?

Gurgling in the boiler is caused by water which reached the boiling point. There are several reasons for this e.g.:
-air in C.H.installation
-incorrect leveling of the boiler (boiler should be slightly leaning forward)
-not enough pump performance

10. What if the controller does not start?

The first step is to read the controller manual, then check the power supply and replace the fuse. If these actions do not bring pected result, please contact TECH controller service.

11. Why is the boiler "is watering"?

Condensation of water vapor from the exhaust is a natural and acceptable at the first starts-up of the boiler. This phenomenon disappears after heating the boiler and the entire system to a temperature of approx. 70 ° C.

12. What is the minimum temperature of the boiler work?

The set temperature of the boiler should be at least 55 ° C. Below this temperature, condensation of water vapor from the exhaust occurs . Acidic compounds contained in the exhaust gas entering into a chemical reaction with water and have highly corrosive properties, resulting in premature destruction of the inner coat of the boiler.

17. Is it possible to install the boiler Rakoczy in a closed system?

Our boilers are approved for closed systems issued by the Office of Technical Inspection. In accordance with the applicable regulations installation of solid fuel boiler in a closed system is allowed on a condition of using recooling valve as a device which drains excess heat. Our company recommends the installation of DBV-1 Regulus two-way thermostatic valve.

18. How can I protect the C.H. installation from the effects of boiler overheating?

In the case of boiler installation in an open system, protection against excessive pressure is an overflow expansion tank mounted at the highest point of the C.H. installation. When installing solid fuel boiler in a closed system apart from the basic security (safety valve and expansion vessel) should be applied to the heat excess removal. This can be, for example. Buffer tank Cooling coil or DBV1 two-way thermostatic valve.