I was always under the impression that boilers have to sit on external walls. However, the house we are contemplating buying has a boiler on an internal wall, in what used to be a larder. It's a brand new condensation boiler, about 50cm high, and we suspect the plumbing was done by a cowboy just from looking at the pipes around boiler and watertank and how untidy it all looks. So - is this dodgy as in, back out of buying?