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I have a 4 zone hot water baseboard system with a single Taco 007 circulator. Here in the North East when the temperature drops towards 0F we can't make enough heat for the first floor. Over 20 years at the property I've asked our service (oil heating) technicians about the problem but got nowhere. I have believed that when a 16 x 16 extension was added, the extra footage of baseboard tacked on is the cause of the problem. In the winter it never reaches temperature. Finally I traced out the system and I don't think it's a lack of BTUs. The boiler is 26 years old but it's still 82% efficient and rated at 112,000 BTU/hr. I think there are imbalance issues but first I want to make sure the heat is getting delivered properly.
- The first floor zone has 73 feet of fins and a total loop length of about 280 feet of 3/4 copper pipe including the heaters.
- The second floor seems poorly designed. It has about 53 feet of fins and about 350 feet of total loop length (3/4 copper pipe). The loop returns to the basement three times to connect different rooms on the second floor.
- The basement zone has 26 feet of fins and a 121 foot loop length. Also 3/4 copper pipe.
- The indirect water heater is on a 1 inch zone and just a few feet.
The Taco 007 circulator is on the return and common to all zones. From my calculations, it only has enough power for the basement and water heater zones. I am guessing the water is just drifting around by convection when the zone valves open, encouraged gently by the pump! With such a range of zone sizes, I'm not convinced a more powerful common circulator is the answer. Any advice for what would help?