Читать книгу Solar Water Heating--Revised & Expanded Edition - Bob Ramlow - Страница 38

Drainback systems need specialized reservoir tanks in addition to the storage tanks. They are like small solar storage tanks and usually hold about 5 to 20 gallons. Some drainback tanks have a heat exchanger built into them. Many have a sight glass built in to the side of the tank for monitoring the liquid level inside the tank. These specialized tanks are available from collector manufacturers and solar specialty shops. As with any other tank, you want to look for glass-lined steel or fiberglass tanks with adequate insulation.