A couple of years ago I put oil central heating in my house. I live in a single floor cottage and run all the piping up and through the loft as the ho****er tank was there and the cottage floor is made from cement. However as we have a coal fire going nearly everyday in winter I thought that if I fitted a wrap around back boiler into the hearth, then it would save me a fortune in oil costs. I now have a good 2nd hand back boiler but have been told it won't be as easy as I thought to plumb it into my existing system. I have an open system, ie not pressurised, My flow and return pipes are 22mm with 15mm pipes being used to supply all the radiators. Some people say it will work fine if I just attach the back boiler to the flow and return others say I will have major problems regulating and dissapating the heat.

Am I making a big mistake or is it a feasable idea......any comments or tips would be greatly appreciated

Thanks in advance

Andy