Case Studies: Multi-Family

Many business owners and homeowners are already committed to greener solutions and have installed solar water heating solutions.  They have reduced their carbon footprint and are recognizing significant savings in their utilities expenses.

The Springdale Apartments Roof Mounted Collectors


Back in the early 1980s, Alan Dauger of Huntington Beach, CA decided to install a solar hot water system at his apartment complex, The Springdale Apartments. Alan wanted to save money on his utility bill and do his part to help the environment. That was during the federal tax credit era under the Jimmy Carter administration. The system efficiently produced solar hot water for the complex for decades.

With the new available incentives for solar hot water systems, including the California Solar Initiative-Thermal Rebate program, U.S. Treasury Grant and MACRS depreciation bonus, Alan decided to replace his old open-loop solar water heating system with a new, closed-loop system. He chose California Solar Thermal because of their proven track record, system design capabilities and high quality system components.

System Component Specifications

  • 24 KIOTO Clear Energy Solar Collectors
  • Anodized Aluminum Racking System
  • 1,160-gallon Atmospheric Solar HX Tank
  • Integrated Pump Station
  • Controller with Variable Speed Pumping
  • Remote Performance Monitoring System

System Description

24 flat-plate, glazed KIOTO Clear Energy solar panels are mounted on the roof, facing south and pitched at thirty degrees for optimum solar exposure. The high-efficiency collectors include copper absorber plates, high density insulation, copper tubing, and a highly selective coating. An 1,160-gallon solar heat exchanger tank, pump station and controls are installed in an enclosure. A non-toxic propylene glycol solution is used as the heat-transfer fluid and is circulated through the collectors and input heat exchangers. The potable water is then routed through the output heat exchangers, collecting the heat. Being a pre-heat system, it then feeds the potable water to the existing water heaters which are used as a backup heat source.