Your chosen plumber will know the best brands around. These are from well respected companies and will have good warranties and years of experience and development in the solar industry.
The good thing about using these hot water services is that you can easily install them by yourself. In addition, they work quickly in meeting your required heating for your water. As a result, you get to reduce electricity cost. This is because you no longer have to consume too much time in heating water.
The first thing you must do is decide what type of hot water system to install. A full time hot water recirculation system could be a big project since you must run a water pipe from the last fixture back to the water heater inlet. If the plumbing in your home has major branch circuits then you might need to re-plumb some of the hot water piping to get the system to deliver hot water to every sink.
Traditionally residential house blueprints do not show how to route the pipes for the plumbing. The locations of the fixtures, sinks, etc. are shown, but not how to connect them. This leads to all sorts of plumbing configurations. The plumbers, often very low paid non-skilled labor, just hook the pipes up however is easiest. I've seen tract homes with identical floor plans with three or four completely different piping layouts.
Rust is one such problem, keeping an eye out for any rust on the water pipes could save homeowners quite a bit of pain. Any rust at all is reason to call in the repairman, who can clear away the rust or replace the pipes if need be. The last thing anyone wants is for a pipe to burst, a flooded house may await you when you step out of the shower if you let rusting go on for too long.
To determine whether it's worth it with a cost/ benefit analysis, simply subtract the tax credit from the cost, and then determine how much you will save each month on your energy bills. If you can save money over a few years, the project was worth it.
As opposed to using electrical heaters, you can obtain hot water from the air and the sun. When you do this, you will be reducing the CO2 that you get from conventional electric heaters.