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Air to Water heat pump pipe layout
Here are my proposed piping layouts so far. They are missing quite a bit of detail like ball valves and such. I wanted to show the general thinking I am having for my system.
Currently, I have a gas boiler with cast iron radiators for heat and a standard ducted central a/c. My a/c is nearing it's end of life and I want to replace it all with an air to water heat pump to reduce my fossil fuel usage.
In the layouts, you will see that I am using the heat pump as a preheat for DHW. I will retain my gas boiler and indirect tank for DHW and as a central heating backup.
I have 3 heating zones and one cooling zone.