Air can occasionally get into central heating systems, often when new water is added. When air gets into a radiator, it rises to the top, preventing the water from warming the upper part of the radiator and cutting down on efficiency. If the amount of air in the radiator is small, the loss in heat can be quite minimal, but if enough air is present it can prevent water from circulating completely. The best way to determine if there is air in a radiator is to compare the heat at the top and bottom; if the top of the radiator is completely cool, or there is a significant difference in temperature, it is likely that air is trapped inside.
Bleeding a radiator is a simple process. Bleeding should be done when the radiator is warm, but not when the central heating is on, as this can compound the problem. First, locate the bleed valve. On more modern radiators it tends to be on the left or right side, near the top, but it may also be on the back, or elsewhere in older models. Insert the bleed key, and turn it 180 degrees anti-clockwise. Usually the sound of hissing air can be heard. When water starts to dribbled from the valve, turn the bleed key 180 degrees clockwise. If your central heating is a closed system, check the pressure after bleeding the radiator, and make adjustments as necessary.
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Radiators may need to be bled from time to time if you find that they are not giving off as much heat as they used to. The usual sign that a radiator needs to be bled is when it is hotter at the bottom and cooler towards the top. This happens when air has got into the central heating system and is preventing water in the radiator from filling up the whole interior.
It is a straightforward matter to bleed a radiator. When the radiators were fitted you will have been supplied with keys for them, which are used for the bleeding. A brass radiator key is used on most modern radiators, whereas on older ones you can use a screwdriver with a flat head. Use either of these to open the bleed valve which will be situated at one end of the radiator, at the top. Switch off the central heating before bleeding any radiators.
Although there is nothing to it, bleeding a radiator can result in some splashing of water, so it is sensible to have a cloth or towel ready to hand to catch any spillage. Insert the key or screwdriver into the valve and start turning it anticlockwise until you hear a hissing sound, indicating that air is escaping. Keep watching the valve and the second that water starts coming out catch it with the cloth and turn the valve clockwise to close it again.
Repeat this process for all your radiators to maximise their efficiency. If your central heating is a closed system, then rather than releasing air from each radiator you will have to top up the pressure from a central hub.
When considering the installation of underfloor heating, many people have concerns about how it is controlled. Can temperatures be adjusted easily? Can the heating to one room be turned off if it is not being used? The simple answer is yes, by using underfloor heating thermostats.
The heating is controlled by underfloor heating thermostats, which enable each room to be set at individual temperatures or turned off if not in use. This is particularly handy for homes with guest bedrooms that are used on rare occasions. Although underfloor heating is extremely cost effective, to have it on it a room that is not being used is wasteful and so the controls will allow you to isolate each room and adjust the level of heating as required.
Rooms that have tiled floors such as bathrooms, kitchens and conservatories, may need to have their thermostats set a little higher as tiling is notorious for being cold underfoot. Children’s bedrooms or playrooms are also the ideal place to have underfloor heating installed, as children tend to sit and crawl around the floor as they are playing.
There is never any risk of being burned by underfloor heating, as it is not designed to become very hot. The system simply warms the floor, similar to a heated towel rail. Heated towel rails are not designed to heat a room, only to warm the towels, but underfloor heating works on the same principal. If a room is particularly cold an additional heat source may be required to warm it, for example, central heating or gas fires.
Radiant heating is a form of heating source that emits radiant energy throughout a space to be heated. Radiant heat transfer is the term for heat emission from a heated surface to the objects and people within an enclosed space. It is also known as infrared radiation. When used in the floor, radiant heating is also known as radiant floor heating or underfloor heating.
The benefits of radiant heating are its relative efficiency and lower operating cost, as less heat is required to warm up a room due to the larger surface used. Its unobtrusiveness – by placing equipment underground – is also a bonus. Also, hot air does not circulate as it does when using convected heating sources such as hot water radiators or conventional wood, gas, oil or coal burner; this can limit the spread of bacteria and viruses.
Despite often being criticised for its lower heating performance when compared with more conventional convected heating sources, radiant floor heating does generate effective warm air circulation within a room with heat rising from the floor, though it is at a comparatively lower level.
One of the first forms of radiant heating was the underfloor heating pioneered by the Romans. This depended on a system of hypocausts – literally ‘heat from below’ – which funnelled hot air from a furnace through a series of under floor ducts and passages.
Other than underfloor heating, radiant heating can also be used outdoors. A pathway leading to a hot tub for instance can now be heated using underfloor heating technology. Driveways can also be heated during winter to keep them ice-free.
If you are thinking about taking on a DIY underfloor heating project, there are a number of issues involved that you need to consider. The type of system (i.e. dry or wet), the type of flooring involved (carpeting, tile, or wood flooring), material and installation costs, and the budget you have allocated for the project are all critical factors. Make sure you avoid the most common mistake that a lot of DIY’ers make when they are installing an electric underfloor heating system, namely under-sizing the system.
This is such a critical issue because you want to ensure that the proper amount of heat will be generated in order to offset the potential loss of that heat. Some houses do not require the same number of heating elements that others do. Homes that are located where the winters are very cold are going to require more BTU’s during the winter months to heat them than homes located in warmer climates.
Another key consideration is the method of electrical wiring that is employed during the installation of an electric underfloor heating system. Many individuals who undertake a DIY underfloor heating system project are not certified or qualified electricians. It is very easy to overload an electrical circuit if you don’t know what you are doing. That’s why it is best to rely on the services of an electrical contractor or licensed electrician in order to handle the wiring of your electric underfloor heating system.
If you are wary of fitting an underfloor heating system in your house then why not use the expertise of an underfloor heating supplier such as Floor Heating Online, they specialise in installing all types of underfloor heating and can advise you on the system to fit your needs.
Underfloor heating is a type of central heating – interior room temperature control for short – that relies on heat conduction and radiant heating to regulate temperature. It is typically used in a domestic setting and provides an alternative to heating by radiators, electric heaters or wood and coal burners.
Heat conduction refers to a movement of heat between molecules, acting to equalise differences in temperature. Radiant heating refers to the emission of heat from a surface, driven by the temperature of that surface. Both are in contrast to air heating – the type of heating provided by radiators – which relies on heat convection. Underfloor heating is typically operated using hot water, electric cables, meshes or film heaters.
Underfloor heating is well known as being first used widely by the Romans. Roman underfloor heating systems were based on hypocausts – ‘heat from below’ – that were operational in public buildings such as baths, as well as wealthier private households. Hot air from furnaces would be funnelled through open spaces under the floor as well as up through spaces in between the outside walls to upper rooms.
Later underfloor heating systems improved in technology: Islamic hypocausts around the twelfth century used networks of pipes rather than open spaces to limit the possibility of fume poisoning and polluted air getting into the living spaces.
Modern underfloor heating often uses heated water, circulated through underfloor pipes, known as wet underfloor heating. Electric underfloor heating uses electric cables and can be easier to install, using less space than water pipes.
In the last couple of decades, underfloor heating has become a standard in many newly built homes. Additionally, homeowners that did not previously have underfloor heating systems are now looking to install them. Because of these trends, we are seeing more and more DIY underfloor heating systems in home improvement stores the world over.
So, with such a rise in popularity, there have got to be both benefits and drawbacks to underfloor heating. Let’s take a look at some of them.
The Benefits – One of the benefits of underfloor heating is that it is more cost-effective than traditional central heating that typically uses radiators. When it comes to wet underfloor heating, it is cheaper because of the circulated heated water beneath the floor. Unlike convection heating with radiators, both electric and wet underfloor heating provides more uniform warmth throughout a room. If you use floor heating systems in the bathroom or kitchen, you’ll notice less moisture in the room as well. Another benefit is that there is no need for wall-mounted emitters, which means you have virtually no restriction on where to place your furniture!
The Drawbacks – The biggest drawback of underfloor heating is that there is a slow response time. This is especially true for underfloor heating systems in which the piping or cable is embedded into a solid floor. For example, a wooden floor may take up to 30 minutes to heat up while a concrete floor may take up to several hours. The cooling time is similarly long. Additionally, placing underfloor heating underneath cupboards may cause “sweating” and damage from moisture in some rooms.
Whether exploring whether to use a water underfloor heating system or an electric one, the basic principles remain the same. Here are two to consider:
The first principle is that it uses efficient radiant heating. Underfloor heating relies on thermal conduction, or radiant heating, to warm up a room, whereas traditional radiators rely on convection, the transmission of heat through air movement. Because warm air rises (think of hot air balloons and how they work), when radiators are used, the warmest air is found at the top of the room, while the coldest air is at your feet.
With radiant energy provided via an underfloor heating system, the warm air starts at your feet and rises. As it does, it is reflected and absorbed by the things around you. The result is a room that is not only warmer at the occupied level, but more consistently warmed, with no hot or cold spots created by the movement of the air. In addition, it has been shown that choosing radiant heating via underfloor heating systems can cost the user up to 20% less in operating costs than a traditional radiator system.
The second principle is that it is an unobtrusive heating system. Traditional convection systems rely on wall-mounted radiators to ‘share the warmth’. This means the radiator is a part of the design of your room, whether you want it to be or not. With underfloor heating, you have an unobtrusive method of staying warm. The source is out of sight, leaving you free to design your room and place your furnishings as you see fit, without the hindrance of a radiator.
Heating a home or place of business can be accomplished by installing an underfloor heating system or the traditional radiator type of heating system. Although underfloor systems are a relatively new concept, many homes and businesses in the UK and the US have chosen this option for heating their structures based on the issues of cost-effectiveness and efficiency.
The radiator based systems have been around for decades and despite the fact that they have improved, based on technological advances and innovations, the basic concept of these systems has remained unchanged. Not only do they differ from underfloor systems in how they operate, they also differ where aesthetic, economic, and the environmental impact on the structure is concerned.
Inner Workings – Underfloor heating systems (or radiant heating systems) use either electricity or hot water to warm the floor and thus the rooms they are installed in. Heat is radiated into the surrounding air above the floor so the room is heated in its entirety without experiencing any cold or hot spots.
Energy Consumption – Anywhere from 10% to 40% of the energy usage you would normally experience with a traditional heating system is conserved when you use an underfloor heating system or an under tile heating system.
Pollution Factors – Whether you install an electric underfloor heating system or a wet underfloor heating system, you are going to reduce not only air pollution but noise pollution factors as well. Additionally, the amount of dust and dust mites being circulated is greatly reduced which is a benefit to those individuals suffering with allergies and asthma.
Today, everyone is trying to save a little extra money. The economic climate has proven itself to be very volatile, just as many of our winters can be. During the winter months, many of us spend more money than we can afford simply heating our homes. What would you say to a home heating method that can help reduce your overall expenditure?
Welcome to the world of floor heating – electric underfloor heating, that is. This floor heating system is the latest in technology and can actually reduce your monthly central heating bill. Basically, underfloor heating can warm your home from the floor. It keeps you cosy and warm by keeping the floor warm and spreading it through the walls of the home. Just remember to keep the windows closed!
Basically, there is a series of interconnected pipes under the floor of the house that helps heat the floor. Electricity is used to heat this system of pipes. Typically, you will have an underfloor heating thermostat that will allow you to select and maintain a preferred temperature. You can install underfloor heating in every room of the home or just the ones you use most – that’s the beauty of it!
With electric underfloor heating, you have control over when you use it and when you don’t. You may opt to turn it on at night, when both the temperatures and the electricity rates are lower. During the day, with natural sunlight helping to warm the home, you could turn it off. Underfloor heating is not only energy efficient, but friendly to the wallet as well.
