You might need assistance in choosing your next heating boiler as this is not a straightforward cost based conclusion. You might begin with the expense but also need to think of other factors, you will need to appraise when and how much hot water you will use at any time, how economical the gas boiler is and what space you have available for the installation.
The most familiar water tube boilers types are:-
Gas Fired domestic back boilers
Back boilers are still found in some families, being installed in the chimney they were obscured from view, the fire obscuring the back boiler behind it. If you do not already have this arrangement then its not going to be a first choice for you as the internal water pressure is low, space can be an issue and there needs to be somewhere to obscure the boiler. A substitute back boiler however could be your best option if you currently have one.
Most times, back boilers are not very economic, but of late large improvements in economy have been made, so by changing an elderly back boiler, you could cut your heating bills through improved efficiency.
Combination heating boilers
The most popular type is now the combi central heating boiler. Combi gas boilers are small enabling them to be squeezed into cupboards and they are cost-effective. Because they heat water instantly from the mains, you do not have to wait for water to heat up – therefore you get an unlimited stream of hot water.
Combi central heating boilers are more cost-effective than the other heating boiler types. Heat losses are reduced as there is no hot water storage cylinder Look out for someone turning on all the hot water taps in your office whilst you are running a hot bath as it could temporarily turn cold.
Unvented central heating water tube boilerssystem heating boilers
central heating system heating boilers store hot water in a hot water tank. You may need to install this in the airing cupboard taking up valuable space. One benefit of this type of system is as many of the central heating component parts are built into the gas fired boiler allowing a speedier and cost installation.
With a central heating gas fired boiler you can get hot water from a range of taps simultaneously, without someone elses shower running cold when they are using it. You can get a good water pressure from a central heating system boiler by installing the hot water tank high in the office.
Open vent system gas fired boilers
The most familiar office system is a vented heating boiler. The open vent boiler requires to water storage tanks to be fitted in the loft, the airing cupboard is still required for the hot water storage cylinder and overall this takes a deal of space.
One of the loft tanks feeds the hot water storage tank with water from the mains.
The second is called the feed and expansion and this enables the water in your central heating system to expand and contract. The only limitation on hot water supply now is the capacity of the hot water tank which will take a while to heat up completely.