Gas central heating boilers and furnacesby Chris Woodford. Last updated: March 2. A few hundred years ago, people would have given an arm and a leg to. Just imagine the inconvenience of. The basic idea of central heating is really simple.

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It's simple, convenient, efficient, and it makes even. Photo: A typical gas central heating boiler. The hot and cold water and gas pipes enter the boiler. The gas jets and heat exchangers are hidden behind the white front cover. What does the boiler do? Photo: The gas jets inside a boiler fire up to. Adobe Indesign Adjust Baseline Grid In Indesign.

Natural gas burns blue when it has the right amount of oxygen. If it burns yellow, there's not enough oxygen and your boiler may be creating a dangerous, toxic gas called carbon monoxide. That's why you should always have a carbon monoxide detector somewhere near a gas boiler.

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Right: This is a very old Chaffoteaux combination gas boiler with its cover removed. The inset closeup photo shows where the gas jets are (at the bottom) and how they transfer heat energy to the main heat exchanger at the top. The boiler is the most important part of a central heating.

It's like a big fire that has a continuous supply of. When you want. to heat your home, you switch on the boiler with an electric switch. A. valve opens, gas enters a sealed combustion chamber in the boiler. The. gas jets play onto a heat exchanger connected. The water pipe is actually one small section of a large, continuous. It passes through.

As the water flows through the radiators, it gives off some of its heat. By the time. it gets back to the boiler again, it's cooled down quite a bit. That's. the boiler has to keep firing: to keep the water at a high enough.

An electric pump inside the. How do thermostats help? Photo: An electric thermostat.

Simply set the. temperature you want (in degrees centigrade). Most people have. An alternative way of controlling your boiler is to have a.

A thermostat is like. How do radiators work?

Photo: A hot water radiator is simply a copper pipe repeatedly bent at right angles. The heat pipes. follow the ridged lines. Water enters and leaves through valves at the bottom.

A radiator is just a copper pipe. It's either completely on or. If you turn the screw down, you switch the. Turn. the screw up and you turn the radiator on, allowing water to flow right. Motorola Surfboard 5120 Usb Cable Modem Install.

In this case, the radiator is on. How do thermostatic radiator valves help?

Photo: Thermostatic valves fitted to radiators can help you heat your home more efficiently, saving energy and money. Instead of having all the radiators in your home working equally hard to try to reach the same temperature. When the heating first comes on, the boiler fires continuously and any radiators with valves turned on heat rapidly to their maximum temperature. Then, depending on how high you've set the radiator valves, they begin to switch off so the boiler fires less often. That reduces the temperature of the hot water flowing through the radiators and makes them feel somewhat cooler. If the room cools down too much, the valves open up again, increasing the load on the boiler, making it fire up more often, and raising the room temperature once again.

There are two important points to note about radiator valves. First, it's not a good idea to fit them in a room where you have your main wall thermostat, because the two will work to oppose one another: if the wall thermostat switches the boiler off, the radiator valve thermostat will try to switch it back on again, and vice- versa! Second, if you have adjoining rooms with thermostats set at different temperatures, keep your doors closed. If you have a cool room with the valve turned down connected to a warm room with the valve turned up, the radiator in the warm room will be working overtime to heat the cool room as well. How do combi boilers make hot water? Most gas boilers also double up as hot- water heaters. Some (open- vented boilers) heat.

Typically, they have two independent heat exchangers. One of them carries a pipe. If it's a central heating boiler, it usually has to. That's why you can hear some boilers switching on and off when.

Artwork: How a typical combi boiler works—using two separate heat exchangers. Normally, when only the central heating is operating. Hot water is made from a separate cold- water supply flowing into the boiler (7). When you turn on a hot faucet, a valve (8) diverts the hot water coming from the primary heat exchanger (3) through. The water from the secondary heat exchanger returns through the brown pipe to the primary heat exchanger to pick up more heat from the boiler (1.

What are condensing boilers? Gas boilers work by combustion: they burn carbon- based fuel. The. trouble with this design is that lots of heat can escape with the exhaust. And escaping heat means wasted energy.

In an alternative type of system known as a condensing boiler, the. They also have at least one notable design flaw. Condensing the flue gases produces moisture, which usually drains. In cold weather, however, the moisture can freeze inside the pipe. Artwork: How a modern condensing boiler works.

Right: In a modern condensing boiler, the exhaust gases pass through an extra heat exchanger (2). This is what makes a condensing boiler so efficient.

The colder exhaust gases exit through a flue in the usual way (3) and moisture produced by condensing them drains away through a separate pipe (4). Can you run a boiler on fuels other than gas? Think of central heating systems as being in two parts—the boiler. For example, you could get rid of. Replacing the radiators is a.

When you. hear plumbers talking about . Do you always need a pump? A simpler and older design, called a. Typically gravity- fed systems have a tank of cold water on an upper floor of a house (or in the attic), a boiler on the ground floor, and a hot water cylinder positioned in between them that supplies hot water to the faucets (taps).

As their name suggests, semi- pumped systems use a mixture of gravity and electric pumping. Find out more. On this website. You might like these other articles on our site covering similar topics: Books.

Articles. Other good websites. Heat and Cool Efficiently: A guide to efficient home heating and air conditioning from the US Government's Energy Star website. Furnaces and boilers: A good overview from the US Department of Energy . This is part of their information on. Space Heating and Cooling, which includes lots of useful guidance on how to choose a new heating or cooling system and considers alternatives to traditional furnace and boiler systems.

Heating and hot water: An overview of choosing energy- efficient boilers, from the UK's Energy Saving Trust.