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 Posted: Thu Mar 29th, 2018 04:48 am
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weyjohn
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Anybody have updated information on efficiency and longevity? I am about to order two for a duplex I am building.

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 Posted: Thu Mar 29th, 2018 04:12 pm
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eleent
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Hello,  I may be the wrong person to answer this as it may come across as negative, but if you want to go tankless, watch this video first: https://www.bing.com/videos/search?q=+why+tankless+vs+tank+water+heater+idiot&&view=detail&mid=BD3AC3043F2340C064A1BD3AC3043F2340C064A1&&FORM=VRDGAR  There are negatives to standard tankless, like longer time waiting for hot water (7 to 15 seconds) inability to deal with hard water, numerous warranty exclusions, and lack of performance, particularly at low flow rates. Getting a "tankless" that has a small tank built in, (like HTP and others make) gets around most of the troubles. Efficiency doesn't help your bottom line much if the unit needs lots of maintenance. Simple equipment is always better.  Have a look at the troubleshooting flow charts for tankless vs tank type heaters. Some tankless units flow charts cover three pages! Studies have shown that condensing tank type heaters are roughly the same efficiency as condensing tankless, with less to fail. ;)

Yours,  Larry

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 Posted: Sat May 12th, 2018 10:35 pm
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pcunite
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My understanding, I'm still researching ... tankless can't output high gpm when the incoming water is less than 50F. I need to supply two showers at once, so that is what turned me away from tankless. As far as efficiency goes, condensing storage tank water heaters are almost better. I suppose if you never use hot water, tankless is better.

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 Posted: Sat May 12th, 2018 10:51 pm
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eleent
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Hi,  You got a chuckle!  If you never use hot water, no heater is best :D
Yours,  Larry

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