Solar hot water systems in hard freeze areas need a little more engineering to avoid a freeze - up, but this is not terribly difficult. (dotearth.blogs.nytimes.com)
We initially thought it was the hot water system in the house and maintenance was very prompt in checking it for us. (BeachhouseFL.com)
Rather, they said, they mean that the understanding of water systems throughout the Himalayan region must improve and water management decisions will need to be made at very local levels. (scientificamerican.com)