Boiler and Central Heating Service

Heating system efficiency depends mostly on carrying out regular services and repairing any faults/leaks as soon as they occur, that’s why it’s important not to forget about this. Central heating system services should be carried out favorably in summer so that there won’t be any problems with heating during colder seasons and winter.

What should be checked?

Boiler and central heating service include:
Checking the ventilation in the boiler/plant room – this should always be the first thing carried out during a service as most serious problems regarding the exploitation of heating appliances are caused by inadequate ventilation. In some cases, it can even lead to CO2 (Carbon Monoxide) escaping and poisoning the household, that’s why it’s important to check whether the boiler/plant room has adequate ventilation.

What is Boiler Service All About?

Most importantly, it’s there cleaning, leak checks, and checking the safety of the device. How frequently a service has to be carried out depends on the boiler power (kW) and their make, as well as a type of fuel used. Boiler cleaning means the removal of any dirt from the inside of heat exchanger.
The frequency of the need to clean the boiler should be checked in the technical documents of the device, provided by the manufacturer. Solid fuel boilers are the ones that need most frequent cleaning, while gas boilers require the least frequent cleaning.
Boiler service is the cleaning of a heat exchanger, condensate trap, the setting of gas valve (ratio CO/CO2) and burner pressure, checking flue, and operation of a safety device.
Power flushing has to be carried out every 5 years as sludge accumulates inside the boiler and central heating. Its removal will improve the efficiency of those devices and reduce bills, as well as increasing the boiler’s lifespan.
Boiler service must be carried out by a qualified plumber (gas engineer), if it’s carried out by someone without the right qualifications then it can result in damages to the appliance. Even cleaning the burner is not easy as it requires the knowledge of how to handle the parts as they can be easily damaged.
Furthermore, wiring connection and the pump must be checked. It’s worth noting that all pumps can cause problems if not used for a long time as dirt in the water accumulates and can stop the pump from working.
While carrying out boiler service, after turning on the appliance, the difference between flow and return must be checked, making sure that it’s not above 10 C. It it’s greater, then it means that not enough flow in the boiler, which can be caused by a dirty filter or heat exchanger, or a fault in the pump.
Pressure should be checked to make sure that it’s between 0.8 and 1.6bar. If it’s lower, the system needs to be filled to the correct pressure. Low pressure might be the result of leaks, that’s why it’s necessary to check all previous areas where leakages occurred and places where such faults can occur.
Expansion vessel must be checked to make sure that it has the right pressure and that the membrane is not damaged.
Relief valve (safety valve) check must be performed to see if it is working correctly and not leaking. If there are any problems with it then it should be cleaned or replaced straight away.

How to Choose Boiler kW

Condensing boilers have the highest efficiency. They are distinguished by the ability of condensation of steam, in the case of non-condensing boilers, steam is released, while consuming a lot of heating energy. This means that the temperature of the flue gas is from 115oC to 120oC. A condensing boilerwith a more innovative heat exchanger can cool the flue gas to a temperature of 30 ° C to 40 ° C. Due to the better use of energy from spent gas, its consumption decreases. In this way, you will pay less for gas – bills can be reduced by 15-20% using a condensing boiler, and compared to an open flue boiler can reduce bills by up to 20-30%

Boiler too small (kW)

Each boiler, including a condensation boiler, cannot operate on low power as heat will escape through walls, roof, and windows. As a result, during cold weather, it would not be able to heat the building enough. However, you can still find yourself in such situation as older houses are not energy efficient.

The problem of unheated buildings can sometimes occur in big houses if the heating device does not have enough power, or during fixing of new central heating installation some problems occurred and wrong pipe dimensions have been used. However, good windows, insulation of walls, floor, and roof play a bigger role.

It is best if the boiler power is determined by a heating engineer (gas engineer). A range of factors are undertaken, including the way of heating up water. Warning! If you have concerns about the reliability of the insulation, you can choose a condensing boiler with 10-20% surplus (which will not affect its efficiency).

Boiler  too big (kW)

Frequently, boilers are bought which have more power than necessary, especially in the case of combination boiler. While, for it to be able to supply at least 10L of hot water per minute, its power should not be below 20kW. If you require more hot water, then you can use a boiler of the power of 30kW or even 35kW. However, if you use a boiler with the power of 30kW-35kW while you house need 25kW, then after a short period of work it can give off enough heat to quickly heat up water and turn off. Thus, large temperature fluctuations can arise in the installation, and the building will be once too hot and once too cold.

If you want a small heating device which has more power, allowing more hot water, you should consider boilers with wide variations of power modulation. These can regulate the power from 20-109%, adjusting easily according to requirements. Such boiler can operate on low power, for example 5-7kW, in case of the need, you can easily increase the power in order to have enough hot water. Such operation of the boiler does not reduce its efficiency, so you should not worry. Though a condensing boiler can reach the highest efficiency.

Romford Emergency Plumber recommends Vaillant boilers due to their high efficiency and quality.

Vaillant has a wide range of products which can easily satisfy your needs and provide the best solution for your house. Reliable work of those boilers is worth the recommendation.