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Home-run Manifold Planned Layouts
Reduce Waiting Time for Hot Water

We are all familiar with the long wait…you turn on a hot-water faucet and wait for the hot water to arrive. Several factors make this problem worse: our houses are bigger, with more fixtures and appliances that use hot water, and the plumbing code is mandating larger-diameter pipes. Experts agree that “roughly 20% of total hot-water use in single-family residences seem to be wasted.”

Manifold diagram

Sound planning saves energy

Heat loss increases with the diameter of the line, the distance the water must travel, and inversely with the speed at which the water moves. A large volume of slow-moving water sheds more heat as it travels to its destination than a smaller amount of water moving quickly.

For that reason, traditional trunk-and-branch systems (with large diameter tubing) are less efficient at retaining heat, than manifold home-run systems, especially when hot-water lines are not insulated.

Home-run advantages:  A home-run system requires more tubing than a conventional trunk-and-branch system because each fixture has its own dedicated water supply. Still, there are several advantages:

  • Water pressure remains stable to all fixtures when several are used at the same time.
  • Hot water is delivered faster, and less water is wasted.
  • Simplified installation means lower costs.
  • Home-run systems work well with open building systems, for less invasive, easier remodeling: Hot Water Distribution – Efficient Plumbing design.

WaterSense guide

This guide is for building and plumbing professionals, but interested homeowners may also find this useful.

LEED POINTS

  • LEED-H EA7 (Energy & Atmosphere) offers 2 points for efficient hot water distribution.
  • NGBS Under Ch. 8 — Water Efficiency: up to 8 points for hot water use reduction based on efficiency hot water distribution system design/layout (801.1).

Note on Pipe Insulation:

  • Hot water pipes may run through cooler parts of the house, such as a crawl space or joist bay in the basement ceiling. Wrapping lines with foam insulation reduces energy loss, and gets hot water to its destination faster.
  • Pipe insulation also reduces condensation on cold water lines during the summer.

It is not that easy to make the right choice.

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