Project data
Authors Mkhultin
Completed 2009
Made No
Replicated No
Cost USD 9,500
Instance of Water heater
OKH Manifest Open Know-How Manifest Download

On Site Solar Hot Water on Haeger Ave, Arcata Presentation by Alan Cook

Solar hot water systems are also referred to as solar thermal heating systems. In a thermal heating system water runs through the panel in a closed loop to gather heat from the solar collector. The cold water is pumped from the bottom of the storage tank when there is a 16 degree difference between the tank and the solar collector. Heat is gathered from the collector and brought back down to the storage tank.

Due to expansion of water when frozen the solar collector cannot have water in freezing temperatures. Freezing temps are only in the morning at this location so draining the system when not in use would resolve the issue. At this site the system uses drain-back gravity feed unit which holds the water at the end of the day. Solar collectors are susceptible to extreme temperatures. Alan believes wind drag can be reduced by flush mounting the panels to the roof. Estimated use of hot water is approximately 20 gallons per person per day. It would take about 6-7 years (depending on use) to payback the cost of the system.

System overview:

  • 2 4x6.5ft flat solar collectors
  • 80 gallon water storage container (converted water heater)

Power offset:

  • 70-80% of their water heating is covered


  • $9,500 installed


  • No info given
Page data
Type Project
SDG Sustainable Development Goal SDG09 Industry innovation and infrastructure
Published 2009
License CC-BY-SA-3.0
Language English (en)
Impact Number of views to this page and its redirects. Updated once a month. Views by admins and bots are not counted. Multiple views during the same session are counted as one. 34
Issues Automatically detected page issues. Click on them to find out more. They may take some minutes to disappear after you fix them. No main image
Cookies help us deliver our services. By using our services, you agree to our use of cookies.