Thanks to Green Home Guide! http://bit.ly/1nRENnx www.greenhomeguide.com
Solar thermal: The best on energy factor however didn’t meet our budget and had to be installed on the south side of our roof which was the front of the house. My wife didn’t like that.
LP Gas tankless: The energy factor is around .94 and is consider by most to be more efficient than the LP Gas tank water heater we currently had at .63 efficiency. Honestly this was the one we thought we would go with from the start. However, I would advise you to weigh the pros and cons before purchase. We found out we would need a water softener to prolong the heat exchanger, warranty coverage, and a larger duct vent through the roof than the one we currently had. A three to four inch duct vent is required. This added 40% to the original price quote. We also noticed a lot of false promises on true savings.
Electric tankless: The energy factor was comparable to the gas instant/tankless. However we needed to upgrade our electrical panel for the install because the electric instant water heater pulls more amps than the standard tank water heater. Plus they advised us a water-softener or pre-filter would be a good idea too.
- Hybrid water heater: This product appealed to us because it was the most innovative and had the highest efficiency -- EF 2.35. Plus it was a lot cheaper than going thermal solar water heating. It also still qualified for the Energy Star tax credit, and was more efficient than gas instant or electric instant water heating.
The family surpised themselves by picking the GE Hybrid! We decided to buy the hybrid, a GeoSpring Hybrid-Electric Heat-Pump Hot Water Heater.