Wanderport;)has tested this unit for some time now,Tweeking so ta say.I spoke to a gentleman in (ACEHARDWARE)today about the(UL)testing time line's on the tank-less heaters in market today.He siad-As long as the thing dos'e not blow up or brake down 2/4 weeks,thay(UL)will slap a stamp on it.No questions, please.
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