The old MBA technique: make the man go fetch the data, huh? It would be unconscionable to install a piece of equipment in a customer's home that is known by everyone to not be durable: http://www.amazon.com/GE-GeoSpring-Hybrid-Heater-GEH50DNSRSA/produc... One poor owner actually says,"I am saddened that the US Government in the guise of the IRS and the Department of Energy are promoting this product. From what I have read in the National Renewable Energy Laboratory (NREL) reports the design concept of this product is excellent but the reliability has been a big issue for many years."
I guess the truth is: they haven't improved! The heat pump portions are made in china, in general, and are known by everyone, except the installer/pushers, to not be durable. Please see my previous blog, the answers are well summarized there!
"they need as much as 7 feet clearance from floor to ceiling. You'll also need up to 1,000 cubic feet of uncooled space to capture enough heat from the air, along with a condensate pump (about $150) if there's no drain nearby. Hybrid heaters are noisier than conventional storage-tank heaters, exhaust cool air, and can rob some heated air in winter." CR doesn't have the durability data yet. Storage tank technology trumps all, at the moment.
Why publish fake studies by a government? These are the same types of people who make you pay out of your federal tax dollars $600 million dollars for web sites that don't work!
Also: there's a warranty. Hmm, most warranties aren't worth anything. When your 2 year old water heater breaks, you have a small baby in the house, & you have to purchase another new one because the heat pump parts won't come from china for another month! Have a heart, just install the storage heater for the nice young person.
Greed isn't good. You'll make more money in the long run by being honest with people(you need me to go fetch the christmas movie film citation on that point now?)
Let's go on & on about a closed subject that I've already covered: water heaters. There is a secret proven technology available today(and for 50 years) that makes water heating much more efficient, that has been totally forgotten. I have one. Why don't the super duper study quoters federal state government experts know about it? Oh, they haven't read the ASHRAE Handbook yet, with all their fake certifications?