How to drain the heating system

When it is necessary to update your existing heating system in order to e.g. change the location of the radiator, an emergency leak, or paint the wall behind the radiator, and etc, we can drain the water from the central heating system. For this we need to stock up on drain hose and locate a valve to drain the water from the central heating. It can usually be found near the radiator or boiler at the lowest level of your house or flat. Place the hose on the tip of the outlet valve and then place the other end out in the garden or in the drain so that it is not higher than the drain valve from the central heating. Turn off the boiler’s power, in case you have an open heating system, shut off the water to the tank which is usually located in the loft of your house. Then, gently unscrew the valve using an adjustable wrench, if the valve is old and does not unscrew then you have to call in a plumber (Emergency Plumber Romford can do this for you). After that, unscrew the radiator bleeding valve at the highest level of your house. This should be done on a cold radiator as a warm one can burn you. After draining the water and performing the planned work, you have to refill water the heating system and inhibitor to the appropriate pressure, check for leaks, bleed central heating system and switch on the boiler. This can be dangerous if done by an unskilled plumber as it can result in flooding of the house and damaging the body of the central heating system. Therefore, the work must be performed by a qualified plumber. Romford Emergency Plumber will do this work for you, quickly and safely.

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.