How Central Heating Works?

Central heating is today one of the basic methods for heating buildings (not only in London). Its centrality is based on the fact that heat is generated in one place and then distributed over the building using a special installation for heat receivers in rooms. The reverse of central heating would be to install a separate source of heat in each room, for example an electric heater. A central heating system provides warmth to the whole interior of a building (or portion of a building) from one point to multiple rooms. When combined with other systems in order to control the building climate, the whole system may be an HVAC (heating, ventilation and air conditioning) system.

In today’s installations, the most common heat carrier is water. In some cases, non-freezing fluids, such as crops, are used – in installations that are not used throughout the winter. Central heating consists of three basic elements: a boiler, a circulation pump and radiators.


The boiler is used to heat the water flowing in the installation. Sometimes it is connected to a hot water container. Its task is to produce heat as cheaply and as effectively as possible. Cheapest, i.e. with the highest possible efficiency and cheap fuel. The circulating pump forces the circulation of the medium through the installation. The heaters, in turn, are installed in individual rooms and there they emit heat to the air. Instead of radiators, floor heating is sometimes used – pipes placed under the floor.

Today, quite often in central heating installations, two-function boilers are installed, which at the same time serve the production of hot usable water. Their advantage is that they combine two functions in one place. Buying one such device, we solve two problems. Perhaps the dual-purpose boiler will not be as efficient as the water heater or the central heating boiler, but it is significantly saved on the purchase, use of space and installation (one thread of gas).

In the simplest scheme of central heating, the boiler heats up the water by burning fuel, which due to the difference in density (it is lighter than cold water) or through pumps flows into the radiators, cools down and returns to the boiler.

In a more advanced central heating system, a coil in a hot utility water boiler is also connected to the water circulation from the boiler. So in addition to heating the radiators themselves, hot water also heats water for utility purposes (taps, shower). Why can not water from the boiler go directly to the tap? Because firstly there would be too large losses in heating the water flowing through the boiler (in the example it is a closed diagram and the water returning to the boiler is already warmer than the one from the network). In addition, the water in the radiators is too hot to be used for utility purposes, and it would be difficult to regulate the heating temperature without affecting the temperature of the hot water.

London Central Heating Installation

If you want to buy a new heating system, replace some old radiators with efficient new ones, or your boiler is more thant 10 years old and it’s time to replace it, contact Boiler Technicians. We offer free quotations and all the free advice you need for replacing your boiler with a new one. Visit our boiler deals for more information.


Do you live or rent a flat in the UK? You can expect a broken water boiler. Statistics say that you can wait up to a working week to repair a broken boiler. Boiler Technicians will arrive on the same day !

We show you how to deal with the problem! Here are some tips.

A dripping boiler

The easiest way to run boiler is to patch the hole with good industrial adhesive. However, it will get rid of the leaking problem for a short time, but enough for the so-called festive failures. In the long run, pits will be created anyway, but gluing holes is the fastest method “for now” and anyone can do it.

Heater problem

The principle of boiler operation says that under the influence of the energy reaching the heater heats up to a predetermined temperature, thereby heating boiler chamber. In a situation where the heater will be too covered with a stone, boiler may show signs of deterioration. In this situation, it is best to replace the heater, if possible, or consult a specialist.


Each boiler is made of metal or its alloy. The metal undergoes corrosion under the influence of water. In order to immunize the surfaces of a heat-generator from corrosion, the so-called magnesium anodes, which are mainly used in boilers with enamelled tanks. The principle of the magnesium anode is based on the fact that it will first corrode before the rust “selects” boiler itself. It is recommended that you inspect boiler to check whether the magnesium anode has been partially or completely worn down.


In each boiler, the influence of temperature changes in water causes pressure surges, and a safety valve must be an essential element of every heat generator. Its task is to open and release hot or hot water, when the pressure in boiler tank exceeds the permissible level. Failure of the safety valve in the heating system at the hot water heater can lead to serious damage to boiler and even bursting it.

Efficiency of radiators

It should be remembered that the radiators have their effectiveness and sometimes we can affect their efficiency. The fastest and cheapest way is to take care of the radiators, because the dust reduces the efficiency. Such a simple operation and can help to reduce gas bills.

Replacing the boiler

The fastest and most effective way to reduce your heating bills is to replace the boiler. Specialists from this industry say about saving about 30% for the heating season. If you do not believe it, ask friends how their bills have decreased after replacing the boiler. Although the boiler means expense. In the case of replacing the boiler, it’s worth taking the time to read what will be the most suitable for us. It is worth taking into account such specifications as efficiency, guarantees and service. Buying a boiler is an investment for many years, so consider what will be the best for you.

The easiest way to reduce gas bills

At the end, for the most stubborn and lazy, we will present the simplest and the most effective way to reduce gas bills in the UK. It is enough to change the gas supplier and it is best to combine accounts with gas and electricity into one, then you often get a discount as you pay a gas and electricity bill at one supplier. How to change the gas and electricity supplier? All you need to do is enter the site of price comparison websites and preferably the specialized website that compares the electricity and gas suppliers.