as agile said, if you want budget boilers biasi and heat-line are good bang for your buck boilers. If you got the dough then I would get a viessmann!!!
The most important thing is to get a good installer and pay him well. Then you will get a well fitted boiler on a clean system that will work the way it should.
The most important thing is to get a good installer and pay him well. Then you will get a well fitted boiler on a clean system that will work the way it should.