The tankless hot water heaters that the villages install south of route 44 in the new section are not on demand heaters. In fact they can take longer to reach your preferred hot water setting, but once they reach that setting the hot water supply will never run out or get cooler. They also save space in your garage since they are mounted on the wall outside your house. Yes they should be serviced and yes you can do it yourself. Some neighborhood groups get together and buy the equipment then share it whenever they need it.
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