Drain back solar hot water heater systems have been in use for decades. The system uses two temperature sensors: a high temperature sensor on the collectors, and a low temperature sensor on the coolest area of the storage tank. The sensors detect when it’s time to start pumping water through the collectors to absorb heat. Solar power preheats water for use inside the home while a traditional water heater finishes by heating water to the desired temperature. So, the warmer the water in the solar tank is, the less energy must be used by the traditional water heater to finish off the job.
Drain back systems have some distinct characteristics, which can make this design an excellent choice for your solar hot water heater system installation.
1. Drain back systems can be used in applications of all sizes, from small homes to large residences, even commercial buildings.
2. Drain back solar hot water heater systems are the most durable. The alternative pressurized glycol systems have a 30% shorter lifespan, because glycols break down over time and their acids eat away at system components.
3. Drain back systems work in any climate. No matter how hot or cold it is where you live, they won’t freeze or boil.
4. Drain back systems have fewer components- this means a drain back solar hot water heater system requires less maintenance and less hassle.
A drain back solar hot water heater system can be configured a few different ways to fit your home and your needs, which we’ll discuss in an upcoming article. If you think a drain back solar hot water heater system may be right for your home, or have questions about solar thermal installation, give the experts at Smith Sustainable Design a call- we’re here to help, anytime.