The Installation Process
River Run’s solar contractor, Arnold Solar, proposed a system designed to meet their specific needs and site constraints. The 192-unit complex of 1- and 2-bedroom apartments is home to eight buildings, each with limited roof space, and its own central boiler that provides hot water to tenants. Each building ended up with its own array of six to eight solar thermal collectors, and one 660- to 800-gallon storage tank located on the ground floor. Installation took place during the winter, and River Run’s tenants experienced minimal disruption, with hot water only being shut off for a day.
River Run also took advantage of the solar thermal installation process to repair minor leaks in hot water pipes and install low-flow shower heads in all their units – two measures that augment savings from the solar thermal system by reducing overall hot water use.
River Run was so satisfied with their domestic hot water experience that they decided to go back and have a solar thermal pool heating system installed as well. The pool system was installed in March, and immediately cut natural gas use by the existing pool heating system by over half.
After installation, River Run started seeing the benefits of lower monthly utility bills almost immediately. Within a month of installation, the property saved nearly $2,500 on building gas use. When they applied for a second rebate to install a solar water heating system for the pool, savings improved even more. In the first year after installation, River Run reduced their natural gas use by over 20,000 therms, and saved more than $27,000 on their utility bills.
RThe systems received a total CSI-Thermal incentive of approximately $147,000, covering just under half of the total system cost. Since then, CSI-Thermal incentive levels have increased. At the current incentive rate, the system would have received a total rebate of nearly $198,000, covering about 65% of the total system cost. For Tom, applying for the rebate was painless, as his solar contractor handled the entire process.
River Run wasn’t the only beneficiary of installing solar thermal. In the first year of operation, the systems reduced greenhouse gas emissions from natural gas combustion by approximately 108 metric tons of carbon dioxide. That’s the same as taking over 20 cars off the road for an entire year.
In Tom’s words, “Adding solar thermal was a cost-effective way to go green, allowing us to reduce our natural gas usage and operational costs without compromising our tenants’ experience.” According to River Run’s calculations, the solar thermal system and associated efficiency upgrades have outperformed original estimates and they expect their initial investment to be paid off by January 2019.