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Combi boilers have a lot of advantages over conventional boilers, but also a few small drawbacks. This article will open your eyes to the things you should consider when purchasing a cheaper model. There are many models of combi boilers available in the market, and like in every other product, the price usually matches the quality and determines the results (you get what you pay for).
1) Possible scaling of the DHW heat exchanger
If the water company in your area, supplies you with hard water, chances are that your DHW heat exchanger will scale with time. In that scenario, you will have two choices; either replace it with an original piece from the manufacturer (which won't be cheap), or replace the whole boiler. Of course this problem can occur with any conventional tank as well, as this is one of the effects of hard waters. The latest and more expensive combi boilers are already designed to reduce scaling as much as possible. Another thing you could do is run softened water thru it, but that would definitely invalidate your warranty.
2) No option of electric immersion heater
With a conventional water storage tank, if for some reason the boiler fails, you have the option of using an emergency electric immersion heater. But the combi boiler is tankless and this option would not be valid.
3)Possible incompatibility between gas pipes
You may need to upgrade the gas supply pipe, because the diameter may not comply with the regulations for installing combi boilers.
4)Good showers, slower baths
Although one of the combis' strengths is to be able to deliver high pressurized water in both your hot and cold taps, a cheaper model may have a modest flow rate of hot water. That is no problem if you are a shower person, because it will supply just what you need to take a nice hot shower. Nevertheless, it maybe a little slower for your bathtub to fill up.
5)It does not deliver instant hot water to all taps
If the boiler is far away from the tap you are using, it may take a few minutes for the hot water to come thru, as it has to travel thru many meters of cold water filled pipes. This is not a problem when filling up a tub or taking a shower, but if you just want instant hot water to wash your hands or fill up a basin, it may be irritating to have to wait and see an amount of cold water being wasted down the drain.

Tom Martin is an expert researcher in the field of home improvements and heating appliances. Read his articles to make informed choices when deciding which heating system is the most suitable for your situation.

Fernox is the UK’s market leading brand of domestic and commercial water treatment products. Fernox provides the perfect answer to prevent scale and corrosion, thus maintaining the efficiency and extending the life of any system.

Extensive research and development has resulted in a range of products to protect the home against the damage that water can cause. This range includes protective products such as central heating protectors, limescale preventers, anti-freezes and sterilisation kits, together with remedial products such as central heating cleansers, limescale removers and leak sealers. Quick-fix products then complete the range for emergency repairs.

Fry Technology specialises in the production and sale of high quality solder alloys and fluxes supplied for a wide spectrum of industrial applications. A significant proportion of these products are designed for the plumbing industry for use in domestic and industrial systems. Its comprehensive range of highly effective solders and compatible fluxes is designed to produce perfect joints, quickly and cleanly – whilst meeting health and safety and environmental requirements for potable water supplies.

Fernox is Europe’s leading manufacturer of domestic and commercial water treatment products. Founded in 1964 Fernox has established an unmatched position within the water treatment industry through research, product development and a customer focused strategy.
Our aim is to deliver cost effective, high performance solutions to all central heating and water problems.
We continually drive to improve the quality of our products and services and to deliver technical leadership to our customers.


Fernox has developed a range of products to help maintain the efficiency of central heating systems and to ensure their long term protection against the damaging effects of corrosion and limescale. The Fernox range of protection and restoration products helps meet the recommendations of the Benchmark code of practice, and Part L Building Regulations, facilitating both pre-commission cleansing and existing system cleansing and protecting.

Limescale remedies, leak sealers, repair products and general plumbing sundries complete the Fernox product range, all designed to deliver industry leading solutions
to plumbers and heating engineers.

http://www.fernox.com