Minimum return on capital improvement

[Michael Healy]

I’m considering a capital improvement on my five unit building which would primarily yield on the expense side

Specifically I am considering converting my oil steam boiler and hot water heater for the entire house to individually metered Hi efficiency gas and on-demand water heater’s

This would mean that each unit would be responsible for its own heat and I would save on oil as Well as potentially the water bill with individual meters for each unit

What do you consider an acceptable return on investment for such an improvement?

I also imagine the improvement would have a positive impact on the value of the building