We have a small 1200 sq foot home in the Sierra Nev. Mtn. at 6000 feet. Our Hot water heater is passing chunks into the pipes. IT is 20 years old. I think we will replace it, but don't know whether to go with a replacement 50 gal. tank, getting the cost plus labor 30% tax credit will help. Or, should be up the price and go tankless. Thoughts?