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Combination boilers and system boilers both carry pressure gauges and we're often asked about the pressure shown on these gauges. Any sealed central heating system needs an expansion vessel, a pressure gauge and a pressure relief safety valve.
If you heat water it expands. In an open vented central heating system (with a header tank) some of the water moves back up into the header tank. The expansion does not increase the overall volume of water by a huge amount (maybe 3 or 4 litres, depending on the size of the heating system) but it would be more than enough to burst the pipes if it had nowhere to go.
In manufacture the air side is pumped full of air, typically to about 1 bar (about 15 psi). This forces the diaphragm right across to the opposite wall of the chamber. When the central heating system is filled with water and pressurised (to about 1 bar) the water pushes the diaphragm back to about the middle
Combination Boiler Replacement & Repairs
Advanced Professional Plumbing & Heating Services
Our Gas safe registered - (corgi) gas engineers have been recommended and trained properly so they can deal with all gas combi boilers, oil condensing boilers, gas condensing boilers, vaillant condensing boilers ,Gledhill system. We normally send our Corgi registered engineers to do gas engineer training every so often. This is what makes us different to other engineers from other companies as we know once they all have been through the training they will become more confident and they can deal with difficult situations of complicated jobs.
When we do the service on gas boilers we service them and do proper checks. We always comply with gas regulations all the time so that you will be assured that everything , every job will be done up to really high standard that is set by the government.
When doing some central heating installations – if they are quite involved jobs or if a few engineers are ever required on sites to complete the jobs. We will be able to accommodate by sending a team of experienced central heating installers who are top class and they know how to deal with unforeseen complications. All jobs are different and they depend on the type of the property, some will need bosch combi boiler, some are suitable for combi boiler installation and some will be more suitable for condensing combination boilers but ever process and possibility will be explained to you so that you know what to expect and not to expect.
What is combination boiler and how combination boiler works
Combination boiler is a design of boiler which can have an increased efficiency over the more traditional boiler. The efficiency of a typical non-condensing boiler is around 75%, whereas with condensing boilers it can be over 87%. This increased efficiency is due to the extraction of heat from the otherwise wasted flue gases. Most boilers have a single combustion chamber enclosed by the waterways of the heat exchanger through which the hot gases can pass. These gases are eventually expelled through the flue, located at the top of the boiler, at a temperature of around 180°C.
Condensing boilers, on the other hand, are designed first to allow the heat to rise upwards through the primary heat exchanger; when at the top the gases are rerouted and diverted over a secondary heat exchanger. These can reduce the flue gas temperature to about 55°C. This reduction of temperature causes the water vapour (formed during the combustion process) to condense and, as the droplets of water form, fall by gravity to collect at the base of the flue manifold. The remaining gases are expelled to the outside environment through a fan-assisted balanced flue. The condensation produced within the appliance should be drained as necessary into the waste discharge pipework or externally into a purpose-made soakaway.
It is only possible for a condensing boiler to work to these very high efficiencies if the flow and return pipework is also kept below 55°C. The flow & return temperatures need to be maintained for the heat transference to occur from the flue to the water (i.e. heat transference goes from hotter to cooler materials).
Many people are installing condensing boilers in homes which are fitted with radiators and a primary flow and return to the hot water. Some of these people may be under the impression they are getting more for their money; unfortunately, as stated above, low flow and return connections are essential; therefore they are not making the vast savings they are led to expect. For a central heating system to work with radiators and hot water primary circuits, flow temperatures need to be around 82°C, so in fact the installer has put in an expensive condensing boiler which gives only slightly improved efficiency over the more traditional boiler. The appliance basically only works in its condensing mode during initial heat-up.
To achieve a system which will function in its condensing mode the installer needs to consider a suitable system of radiant heating.
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