On demand electric water heaters are installed under a kitchen or bathroom sink to provide instant hot water only when needed. Because plumbing runs are short and hot water isn't heated unless it's being used, these units reduce water-heating costs. On demand water heaters also reduce plumbing costs in new construction because only cold water lines must be run to the kitchen and bathrooms.
You can cut the cost of wood glue for workshop projects significantly by buying your glue in 1-qt. or larger containers. To make it convenient to use, transfer the glue as you need it from the large bottle to your own squeeze bottles or a glue pot.