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I'm upgrading a heater-type stove, now with a copper tube Ф15.8mm. In previous videos (see on the channel) I explained what engines I installed. But I'm unlikely to be able to give a link to them specifically, I quit them a long time ago (6 years ago), maybe there are no such ones on sale. But now there are a lot of others, for example 12V low-power ones, those that I installed in boat pumps (see videos on the channel)