Brew Pumps: $99
This 12 Volt DC Circulation pump is designed to work with a 15PV solar panel. Don’t have a solar panel? You can also easily adapt it to work with any other 12V source such as a car battery or cell phone charger. It has 1/2 Stainless Steel NPT for the in and out.
These will pump 11.5L per minute (3 gallon per minute) up to a 3 meter rise (5.8 feet). With a max working temperature of 110 C (230 F) you know it will be safe for hot water transfers.