Adding water loop to steam system

Bob W._3

This article is found on this site:

http://www.heatinghelp.com/heating_howcome6.cfm

Should answer all your questions. Boiler capacity will not be affected.

Alden Maddry

Adding water loop to a steam system

I have a one pipe steam system that I would like to modify. I will be adding a greenhouse onto the back of my rowhouse and I want to determine whether I can tap into my existing steam system to heat the greenhouse also. A home inspector told me that there is a way I can add a "water loop" onto a steam system. He said that this would work better than installing additional steam radiators off the system. Does anyone know about doing something like this? Will my boiler capacity effect whether I can do this?