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Ive installed several over the years. The gas is much more efficient than the electric. but beware if you are used to plenty of hot water these tend not to deliver due to flow being constricted in the unit in order to bring the water up to optimum temperature when demanded. Most of the ones my company installs is in tenant space of office buildings where they only serve kitchen sinks and hand sinks. For this they work great. Val- If you have natural gas take a look at the power vent water heaters. They even condense the fumes and use as fuel and are super efficient. One 40 gal will give you more hot water, quicker and more efficiently than an 80 gal electric.
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