After having some tree trimming done, we realized that our solar domestic hot water heating panel (already 18 years old) was doomed to be shaded by a growing oak tree within a few years. At the same time, the 12 year old solar/electric hot water heater started a slow but persistent leak, pointing to some sort of internal corrosion failure. Aztec had done very satisfactory work on installing and servicing our solar pool heater, so we called on them for an estimate. Tony (lead for services) came out and did a full review, and had several excellent suggestions on what options we had. We decided to keep the solar panel (old, but well built and with years of useful life remaining), relocate it to the back of the house, and replace the hot water heater. As soon as the necessary materials where on hand, Earl and his crew showed up at 8 AM and went to work. All the tasks were completed to our satisfaction and Earl walked us through all the changes and how to best use the new systems. The work area was left clean and clear, and all trash removed. It wasn't cheap, but we have 20 years of experience with the value of this type of system and look forward to many more years of ample supplies of hot water from the sun.