I live in Virginia, have a 20+ year old electric HW in a semi-conditioned basement that requires dehumidification at least 1/2 the year, so I'm a good candidate for a HPHW. We currently have a 50 gallon tank for a family of 4, and it has been fine, but the kids are very young and we might not quite yet be done growing as a family. I've heard about the longer recovery time with HPHW and seen several recommendations to go with 80 gallon sizes for that reason. The 80 gallon integrated units are too tall for my basement (and pricey). So I'm trying to decide between a 60 gallon AO Smith Voltex or buying an 80 gallon electric tank and a Nyle Geyser. Some of the aspects I'd appreciate feedback on are: 1) Is the higher efficiency of the Voltex and its smaller tank size a net efficiency gain over the 80 gallon/Nyle combo or 2) would the 80 gallon/Nyle combo enable us to stay in heat pump mode longer than the 60 gallon AO Voltex thereby being the more efficient scenario (assuming a family of 4-5 is pushing the limits of the Voltex)? 3) What is the life expectancy like on the integrated units - how big of a plus is it in the Nyle's favor to be able to separately replace the tank down the road if it fails first? Thanks.