[NiHaoMike]

Then your setup is going to be easy. For the main, build a water to water heat pump plus a few valves to bypass it. For hot water, first stage would be a heat exchanger to preheat it using the heating water. Second stage would be a separate small heat pump (a hacked window A/C would work nicely) that is either air source (if dehumidification might be needed) or water source off the solar tank. Run R22 or an equivalent in a R410a compressor so it will handle high evaporating and condensing temperatures with ease.