ROI Analysis on Low Flow Toilets

[Gwyeth Smith]

Has anybody done a ROI analysis on installing low flow toilets in their multi-family properties? I have a 13 unit that I am paying water on. RUBS is not allowed in the commonwealth of PA so I would need to sub-meter to pass that expense along. I have already installed low flow shower heads and am looking on what the utility savings would be on installing low flow toilets compared to the cost to install. The hold period is 5 years on the project. Any insights would be appreciated.

Gwyeth

[Vergel Anastacio]

I have a background in energy engineering and significant water savings can only be achieved for buildings with 20+ floors. In the case of 13 units, I would estimate that you can save from 1% up to 3% on yearly savings only. Water Savings is minimal compared to changing your conventional fluorescent lamps to LED which can give as high as 60% savings annually regardless of the size of the building/house.