Boilers supplied and fitted from Dublin Gasworks
H.E High Efficiency Boiler:
These are modern gas boilers offer called condensing or condenser boilers and are not to be confused with combi boilers. They operate at a much higher efficiency than a standard efficiency boiler – very little flame heat is lost via the exhaust and almost all of the heat generated by the flame is transferred into the central heating water. Many of these boiler also modulate and therefore use only the amount of gas needed to keep the heat at a constant.
These boilesr can use between 30 and 40 % less gas than older SE (Standard efficiency boilers) They require regular anual servicing to maintain efficiency with major service every 5 years. On top of anual servicing, these major services are essential to ensure the operational life of the boiler, it can take up to 4 hours to perform these major services and is not classed as standard service which should be performed each year.
Combi HE Combination High Efficiency:
These boiler are almost identical to a HE boiler but have 1 added feature, you do not need a hot water cylinder (calorific) as your domestic hot water is provided by the Combi Boiler directly. The boiler will have a secondary internal heat exchanger fitted to provide “On Demand Hot Water”. This eliminates the need for stored hot water – you only heat what you need, when you need it. This is a far more cost effective method of domestic hot water generation. However a home needs a water supply with good pressure, flow rate and adequate pipe sizing.
S.E & Combi SE Boilers: Standard Efficiency Boiler:
Standard efficiency boiler are generally more robust and take more abuse that more modern efficient boilers, however they are very expensive to run and maintain as most are well past the half way mark of the life span. The do not condense or modulate.
A system boiler is generally a boiler that comes with its circulation pump and expansion vessel integrated within the boiler casing. They area available in HE, HE combi, SE and SE Combi. The are very compact and tidy in appearance with no external pumps or vessels. However replacement parts are expensive and sometimes difficult to install due to the location of boiler in kitchens and cupboards etc where restricted access an be a problem.
Heat Only Boiler:
As the name suggest, heat only boilers provide only heat, the have no integrated pumps or expansion vessels – these are normally installed outside the boiler on the pipework. Most older boilers tend to be heat only, though modern HE Boilers are available in this format.
Older Heat only boiler tended to be very robust but inefficient by modern standards – many are obsolete and spare parts are becoming hard to come by.
Modern HE Heat Only Boilers are not reliant on model specific replacement pumps and expansion vessles, therefore will be cheaper to repair when and if these items warrant replacement.