Why is my oil-fired hot water baseboard heat burning so much oil? added a third zone, furnace runs constant?

We added an addition with the third zone, and the furnace was not heating the room - just ran constantly. So the plumbers adjusted the water temp to 170 degrees. Now the furnace runs most of the time, and we have consumed twice as much oil as this time last year. The room does heat well now.Why is my oil-fired hot water baseboard heat burning so much oil? added a third zone, furnace runs constant?
I don't want to ask a dumb question, but is your addition the same square footage as the original house?





Some other causes might be;


1. poorly insulated doors/ windows/ walls in the new addition


2. poorly insulated piping in attic or crawl space of new addition


3. much colder outside temperatures this year/ last year


4. burner performance- get burner efficiency checked/ cleaned





Also- how long did the addition sit open before they got close- in. You might have been losing heat during construction causing boiler to run more.Why is my oil-fired hot water baseboard heat burning so much oil? added a third zone, furnace runs constant?
Compare outside temps between this year and last.





Make sure your t-stats are where they should be.
Do the math. You are using the same sized furnace with an additional zone!

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