Would like to know of a top rated hot water boiler radiator system for a single family home. I have heard of the Munchkin but it is not sold here in the south. The one we have is very old and we need to replace it. Our home is 3,000 square feet and one story. I would like to pay around $3,000 if possible. Thanks for your answer, JM

Square feet isn't used. The number of people and the number and kind of baths typically will.

Hot water recirculating systems and point of use heaters can help.

There are two of us and we use one tub, the old kind and one shower.

From your post I assume you are looking for a boiler for heating, not hot water for domestic use. The Munchkinis available just about everywhere in the country. Just check out the website and they can direct you to dealers.
Heat Transfer Products, Inc. - Manufacturer of Boilers, Water Heaters, Solar Water Heating Systems and Storage Tanks
Good luck.