I own a 165 old stone house and my sons house is about 65 years old and we
both have hot water heating systems. Like everyone else we are looking for
any new technological advances that would help us improve the efficiency of
our heating systems. I have a mid efficiency Viesmamn boiler thats about
15 years old and my sons boiler is about 30 years old.

Any info on how to improve the efficiency of our systems would be much
appreciated.

Thanks in advance

Jimbo