My suggestion is, get out and see these things in action if you can; i.e. different makes, different models, etc... and see how they are connected to their existing system and make a decision based on that information. Everyone on here will have an opinion based on their make and model and if they had any trouble with it. Personally I love my Central Boiler E-Classic 1400. I experienced a minor hiccup a couple of months into my first year operating it (this is my 4th winter with it) but that was due to laziness on my part and not being attentive. Since then no problems at all. Essentially it comes down to the age old argument, which is better, Ford, Chevy, etc... everyone has their opinions. Good luck in your search. Remember one thing, you will not be paying out big dollars for oil or propane regardless of which unit you decide to purchase. Have a Merry Christmas! Roger