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Are these systems gas operated or can you get them in all electric? If so, are they as cost efficient as an electric HWH?? Inquiring minds want to know. How about it Dave, what is yours? BTW, While living in Spain in the 70's, they were called "Flash Water Heaters" as they were usually located near the kitchen sink and would flash when the hot water was turned on. Kind of scary at first.....We used butano gas to power them.......So they have been around quite a long time....
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