This may have been a subject before but I could not find anything.
Three bedroom house with 2 full baths. Had a gas direct vent water heater size unknown because it was replaced with a 40 Gal electric water heater when the upstairs was finished off. They added another bedroom and bathroom upstairs. So the home is now 4 bedroom and 3 full baths. One bath has garden tub. A 40 gal. WH is undersized is it not? By what means do they calculate the size of a water heater for a home. Is there anything written?

Thanks

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Mike Schulz License 393
Affordable Home Inspections
www.houseinspections.com