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Heat Loss Calculation Not Needed
After being in business for almost 20 years I got a job at my local municipality. I like it. I'm happy. I started in February. My municipality has grant funds for repairs on homes for low to moderate income home owners.
So. I have a chance to replace a boiler. Gravity fed, natural gas. I re-read the first chapter of "How Come?" and then tried to get a heat loss calculation done.
You'd have thought I had sprouted another head the way one contractor looked at me. He confidently told that it's not necessary.
Another contractor told me that a modulating boiler makes a heat loss calculation unnecessary because a modulating boiler knows how many BTUs the house needs at any point in time.
Is the first chapter in "How Come?" still valid?
Is this 2006 thread still valid? https://forum.heatinghelp.com/discussion/112286/replacing-gravity-heat-boiler
Is this article (2016) still valid? https://www.greenbuildingadvisor.com/article/sizing-a-modulating-condensing-boiler
Thanks for your help,