The Advantages and Disadvantages of Each Type of Boilers

The boiler engineer Hampshire is composed of experts who know everything regarding each type of boiler. In this post, the boiler experts in Southampton will provide you with the advantages and disadvantages of different boiler types.

It cannot be denied that an average person knows a little information regarding boiler servicing, replacement, or repair. That’s the reason we are doing our best to send help and information to everyone who needs a boiler replacement to get the right thing needed instead of purchasing what someone is selling to you.

If you are looking for additional information that will enlighten and assist you in making a right decision when you are planning to purchase a new model or boiler, you are in the right place. In this post, we are going to provide you details regarding the boiler repairs in Southampton. If you want to know more about it, then keep on reading!

Various Types of Boilers

A Condensing boiler is available in three different types that you can purchase in the market today. These are the system boiler, the heat-only boiler, and the combi boiler. Each type of boiler has its own set of pros and cons. First, let us discuss the first type of boiler, which is the combi boiler.

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Combi Boilers

Compared to the two remaining types of boilers, the combi boilers are the most popular as it uses gas for creating heat. This type of boiler produces heat that will then be distributed to the room evenly. Its name suggests that it is a boiler that features the combined functions of a traditional and modern boiler. This features a hot water cylinder and cold water cylinder. Not only that, but it also features a standalone unit, which enables you to install it easily and conveniently.


  • - It refills your hot water cylinder instantly.
  • - A combi boiler is an economical choice for those who have a small business or small household unit
  • - It has a compact-sized heating system.


  • - It is not suitable for large-sized homes
  • - It fills and runs a bath slowly
  • - You need to wait for some minutes to get hot water

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Heat Only Boilers

If you prefer older heating systems, then we recommend you to opt for heat-only boilers. It produces heat directly from the radiators. It comes with a hot water cylinder, which holds hot water. Aside from that, it also provides you with cold water instantly.


  • - It features a large tank that holds only hot water
  • - It is perfect for homeowners who use hot water more frequently
  • - You can replace it easily


  • - You have a limited amount of hot water
  • - It is not energy efficient
  • - It requires more space compared to combi boilers.

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System Boilers

This type of boiler features two tanks that require additional space. It does not require expansion and feed system though you need to have a separate tank for cold water. We recommend this type of boiler for a modernized home.


  • - It does not need an expansion tank
  • - It is good for large-sized houses that require a high demand for hot water
  • - It can be installed easily


  • - It requires more space compared to combi boilers
  • - It is not energy efficient
  • - You have a limited amount of hot water

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Frequently Asked Questions

If this happens, it might be a result of low pressure or blockage in the system, which is restricting the flow of water. In some cases, there could be a fault with a closed valve, thermostat or aa pump causing the water not to circulate properly. We recommend contacting us for assistance in diagnosing and repairing the fault by a Gas Safe registered engineer.
The most common causes of leaks and boiler dripping water are faulty internal components, this includes but is not limited to issues with corrosion, broken pressure valves, pump seals, or loosen pipe connections. We recommend calling out our Gas Safe registered engineer, who will diagnose and fix the problem for you and stop any potential dangers. You should never try to fix a boiler yourself, always call out for professional help.
Kettling sound from your boiler ( similar to a boiling kettle ) is usually caused by limescale or sludge buildup inside the system. It often happens in areas with hard water. The deposits build up in your boiler or pipes can block or restrict the flow of water inside the system, which can result in overheating and weird noise. It is best to treat this as soon as possible because it might result in more severe boiler damage and higher costs if your boiler needs replacing. We recommended calling our team as soon as you notice kettling sounds from your boiler. Our engineer will drain your central heating system and remove limescale and sludge buildup. For more information on this method, please visit our Power Flush section.
Worrying noises from the boiler are usually caused by low water pressure, a faulty pump or air buildup in the system. The type of sound in your system can narrow down the source of the problem. Banging noise could be a result of imminent pump failure, and this happens most often in old systems that have not been serviced regularly. We highly recommend contacting us to book our Gas Safe registered engineer for a professional diagnose of the problem as soon as possible.
The blue flame that always stays lit is called a pilot light. If this pilot light keeps turning off, it will stop your boiler from working. It can be caused by a broken thermocouple, which would stop the supply of gas to your boiler. Sometimes also the problem could be a draught blowing the pilot light out or a deposit built up in the pilot light. Always remember that you should never carry out any work on your central heating system. There is one thing that you could check yourself before calling out an engineer: Check if your other gas appliances are working and that your gas stopcock is on. You can always give us a call, and we will be more than happy to help you.
The most common causes for this to happen are faulty airlocks, diaphragms, motorised valves, thermostat or low level of water in the system. Your heating system might require a new part fitted to be working correctly again. Give us a call today for professional advice. If necessary, we will book a Gas Safe registered engineer for a professional diagnose of the problem as soon as possible.
It is straightforward to check the pressure of your central heating system; just take a look at the pressure gauge on your boiler. Low pressure ( below 1 ) will cause your central heating system not to work properly. It can be a result of a few potential reasons. Some of the reasons for this to happen could be a water leak in the system, recently bled radiators or a faulty pressure relief valve. We recommend contacting us for assistance.
All condensing boilers ( combi, system or regular ) have a condensate pipe transporting excess water away from the boiler. During winter it is common for the water to freeze and cause a blockage. If this happens, your boiler will most probably display a warning or a fault code. Feel free to give us a call; we will be happy to assist.
It might be a sign of a faulty thermostat when the heating is turning on and off when it is not supposed to. If your thermostat starts to malfunction or loses its accuracy, it will probably need to be replaced. Give us a call today for professional advice.
If some of your radiators are not getting hot, then they might need balancing. This procedure can also be done without the help of an engineer, but only if you feel confident doing it. If only the bottom of your radiator is getting hot then it might need to be bled, it is not a difficult task, and it does not require an engineer. In some other cases, there could be a build-up of sludge or air in your central heating system. Our professional engineers can remove this build-up by a process called Power Flush, and this is something that you should not try yourself.
All of our installers are fully trained, and qualified Gas Safe registered professionals.
We will recommend the best possible boiler for your needs, in terms of brands we mostly recommend Valliant and Worcester Bosch.
Harrison Heating has a team of professional engineers covering all of Hampshire. Most of our work so far has been carried out in the following areas: Southampton, Eastleigh, Fareham, Chandlers Ford, Whiteley, Winchester, Portsmouth, Winchester, Hedge End, West End, Botley, Romsey, Totton, Lyndhurst, New Forest, Hythe, Marchwood, Netley, Gosport, Twyford, Hamble, Holbury, Wickham, Titchfield, Nursling, Ringwood, Salisbury, Cosham, Waterlooville, Fair Oak and Lee-on-the-Solent.
Yes, we provide free quotes without obligation from your side to accept our quotation.
To give you the best and optimal solution we will need to know few details. For example, we will ask how many rooms and bathrooms you have currently or if you are planning any future extensions of your house.
In most cases, we can install your new boiler in the next working day. It depends on the current workload, so please give us a call as soon as possible if you are in a rush.
It usually takes one day to fit a new boiler by our professional installation team.
It is required by law that all servicing and gas safety checks are made by a Gas Safe registered engineer. It is also a condition of the warranty if your boiler is still under one.
We will do all possible safety checks, inspection and test all critical components to make sure your boiler runs safely, reliably and efficiently.
Please feel free to use our website to leave us a short feedback message. We are always happy to hear from customers about the outcome of our work. You can also read other customers reviews in the feedback section of our website.
Underfloor heating can be installed in most houses under almost any type of flooring. It gives you the option to have different zones heated and controlled independently. It comes very convenient in terms of managing heat distribution depend on which rooms are being used at the time.
Of course, you can! It is even recommended if the room is big enough, the area of heating can be split into sections. This approach works great with open-plan areas like kitchen diners.
Underfloor heating gives you the ability to warm up naturally cold ceramic or stone floors efficiently. It distributes the heat throughout the heated areas more equally compared to the radiators. Once installed, the underfloor heating requires less maintenance compared to central heating.
The underfloor heating gives you more control, increased comfort, better heat distribution, and it costs less to run. Underfloor heating provides a cleaner radiant heat causing less discomfort to asthma and dust allergies sufferers.