1 Solar-powered home water heaters cost $1,000-$3,500 (including installation) but have extremely low monthly operating costs and can be used in any climate, according to the US Department of Energy.2  The cost for a solar heating system can vary widely. Prices vary based on building and system configuration, the type of equipment selected and other factors. 2  Generally it costs less to install a system in a new home rather than remodeling an existing one, although it can be practical to install a solar system while replacing the roof.
herb, spice, seasoning - Herbs are, technically, plants with aerial parts used for seasoning foods, and a spice (also called seasoning) is any substance used for seasoning foods; many herbs are used as spices, but not all.
Noun. 1. herb-a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests. herbaceous plant. veg, vegetable, veggie-edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant.erb. 1. a flowering plant whose stem above ground does not become woody and persistent. 2. such a plant valued for its medicinal properties, flavor, or scent. 3. Often, the herb.