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枫下家园 / 美丽家居 / 再次请教：家里租用的是Direct Energy的Water Heater，我看了一下大概是48加仑的那种。查了Direct Energy的网站，相应的是“PV50/DV50 50Gallons"。 请问那个PV和DV分别是什么意思？谢谢。
-eagle(seven11);
2008-1-26
(#4217819@0)
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CV=Cnventional Vented
PV=Power Vented
DV=Direct Vented
-mpoon(无牌电工....);
2008-1-26
(#4217838@0)
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mpoon, 他们最大的区别是什么？
-eagle(seven11);
2008-1-26
(#4217890@0)
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search in goggle with power Vented,Direct vented, Conventional vented, you will find all the info you want to know,Power Vented >>http://www.johnwoodwaterheaters.com/pdfs/50000D.pdf
Direct vented>>http://www.chimneysweeponline.com/hodvent.htm
Conventional vented
-mpoon(无牌电工....);
2008-1-26
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(#4217917@0)