thanks Scott. I’m hoping to stumble on a general analysis. Can you recommend a simple calculator for the data inputs? I’ll look for product specific EPDs, then quantify CO2e for the rest of the components: piping; tanks; ducting; and yearly usage, based on my region. I’m working on a presentation for our local builder’s association to prove its not just first cost that is important, but the upfront equivalants and long term emissions on the operations side as well. dollar for dollar heat pumps and on demand tanks are reasonably close in $$/gallon output these days, so where is the incentive to decarbonize hot water besides ending useless wars over oil and the health and safety of close-to-refinery communities?