Why should I use solar instead of an instantaneous water heater system?

Instantaneous water heaters only replace about 15-25% of the energy used by a conventional water heater while solar water systems replace 70-90%. An article by Consumer Reports states that the tankless heater savings can add up to some $50 per year compared with conventional heaters. But even at that rate, it will take more than 25 years for an average household to recoup the extra $1,300 or so those units cost to buy, install, and maintain.

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