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Takes more energy to heat up thermal mass at start up, which when no longer needed is then wasted as it cools down slowly.Lots of insulation and minimum thermal mass is cheaper and faster to heat up and less is lost as it cools down.OTOH if you want continuous steady heat then thermal mass helps as a buffer and heat store - perfect for a long Russian winter. Russian stove - Wikipedia
Takes more energy to heat up thermal mass at start up, which when no longer needed is then wasted as it cools down slowly.
Lots of insulation and minimum thermal mass is cheaper and faster to heat up and less is lost as it cools down.
OTOH if you want continuous steady heat then thermal mass helps as a buffer and heat store - perfect for a long Russian winter. Russian stove - Wikipedia
