There is one small consideration. Should anything happen to the boiler breakdown you would be left with no heating and hot water. This is because there would be no hot water tank with an Electric Immersion to heat your water as a back-up. Thats something to keep in mind. Combi boilers can be Condensing or Standard efficiency. Most customers find it easier to allow their installation engineer to buy the boiler.
Think again. There are, however, a few disadvantages to installing a combi boiler:. Combi boilers provide the owner with access to instantaneous hot water and central heating. The two systems have independent heat exchangers — one that links to your radiators and another that connects to your hot water supply. The heat exchanger then gets hot enough to heat the water that flows over it. Combi boilers come with heating controls that you can use to set your heating to the desired temperature.
This guide has explained the fundamentals of what a combi boiler is and how one works. To learn more about the other types of boiler, check out our guides to system boilers and heat-only boilers. Find out how you could train as a domestic gas engineer by downloading a free copy of our information pack. Quoted for Combi boilers, a flow rate represents how many litres of hot water comes out of the tap in a minute.
Your flow rate is determined by the amount and pressure of water that is entering your property from the water main and the ability of the boiler to heat that water to the temperature you have set. The more powerful a boiler is represented in kW , the faster the boiler will be able to heat the water coming into your home. However it is important to recognise a high kW output will not always increase your flow rate. If you have 10 litres per minute coming into your property, you will only be able to receive 10 litres per min of hot water.
For example having a boiler that has a maximum flow rate of 14 litres per min will not increase the amount of hot water you receive, if you only have 10 litres per min coming into your boiler. Gas Safe Accreditation is the hallmark for gas safety in the UK. An installer must be on the Gas Safe Register to be legally allowed to work on your boiler or any other gas appliances in your home. Greenstar is the name given to all of the Worcester Gas fired boiler range, and signifies high energy efficiency, reliability and comfort.
There are more than 2 million Greenstar Combi boilers fitted in UK homes. OFTEC is a trade association that takes a lead role in setting industry standards of oil-fired boilers. OFTEC manages a competent person registration scheme, enabling you to find installers who install, commission and service oil-fired products. This is a term which is also used to describe a Regular boiler type. This type of heating system is typically common in older properties. It provides a rating structure which provides both a percentage efficiency score as well as A to G rating enabling an easy comparison of boilers.
A system filter is a specifically designed unit which aims to remove and filter magnetic and non-magnetic contaminants from your central heating system before they reach your boiler. Building Regulations always recommends a system filter be fitted to your heating system pipes prior your boiler to prevent any damage to key components.
Unlike Open Vent boilers, combi boilers works through a closed system. If any air gets into the system, it affects the boiler, pump and the heating. If the boiler loses further pressure, it will stop working and show an error code on the display.
Sudden pressure loss may be caused by a loose or rusty connection. A filling loop is used to get the pressure of a combi boiler back up to recommended levels. Every boiler has a pressure gauge on it, usually next to the display. The pressure on a combi boiler should never be allowed to drop under 1 bar or go over 3 bar. A safe range is between 1.
If your boiler pressure drops below or goes above the levels specified by the manufacturer, the filling loop can be opened until the combi boiler pressure returns back to normal.
How a combi boiler works can be very complicated and requires the best, safest installation possible. Illegal gas workers are prosecuted on a daily basis, and for good reason. If you decide to ignore our advice and try to save a few quid by breaking the law and install the boiler yourself, and have your Gas Safe Registered friend sign off on it, both of you are in breach of the law and can face hefty fines and also, prison.
There are armchair experts on the internet who may try to convince you to save money and install a boiler yourself. As we mentioned above, most importantly you will be putting yourself and your family in danger.
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