What do boilers Cost?
The cost of a new or replacement boiler will depend on the type & power of the boiler you choose – there is great info about boilers here: http://www.localboilerquotes.co.uk/boilers-prices-guide/.
What you will need to establish in terms of the type of boiler is, firstly, how much hot water are you going to use at the same time?
High simultaneous demand for hot water could be too much for a combi boiler to handle & in that case you ill require a more robust system to handle the usage – maybe a condensing system boiler would be more suited to the type of home that you have as they are more powerful and can supply a lot of hot water for use in the kitchen, heating & bathrooms.
In any event, it is going to be prudent to do some research beforehand as this can at least give you an idea of what to look for & what questions to ask when you speak to a gas boiler installation company – you should also make sure that the installer is a registered “gas safe” engineer.