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Posted by Harold hydronicnetwork.net on March 20, 2004 at 10:01:01:
In Reply to: Re:Adding on to existing system posted by Andy C. on March 20, 2004 at 09:18:03:
As you are building a roof addition. your heat loss for the total house will GO DOWN because building code requires you to put insulation in the addition well beyond the original standard. A 1000-square-foot house today has a heat loss of less than 25 btuh per square-foot. If your older house was insulated to today's standards, it would have a heat loss of 25,000 btuh, or roughly 1/4 the output of your boiler. The heat loss of your older uninsulated house now is probably 70,000 btuh.
This means that your boiler probably has the capacity to heat the addition as well without a problem, though a heat estimate would give you definite answers to that.
You can make a copper loop from and to the boiler with a separate circulator to make the upstairs an independent zone; this will bypass any problems about the cast-radiation on the downstairs zone.
You can do a FREE heat estimate and read what you need to know in the lessons at:
http://www.hydronicnetwork.net
which is the only location on the net that has the full information to teach hot water heating on-line.