Hello mate, i can safely say that you/they will be struggling to find a reliable boiler for such a low budget!
At best you/they will only be able to get something along the lines of a protherm, ravenheat, biasi, or ferrolli and they are all pretty poor to say the least!!
They would be better off spending more money and getting a top brand boiler i.e a vaillant or a worcester boiler both manufacturers have excellent track records, and offer a good level of service and breakdown cover whilst the boiler is under warrenty.
Hope this helps
