Hello, thank you for your reply.
Actually there was not a water heater specified, just a storage tank. So I will suggest modeling the Chiltrex unit as a ductless heat pump with indoor distribution units. If the installer can also install it as a radiant floor then great. I will be sure to include slab edge insulation in case the slab becomes a heated-slab. I will suggest a heat pump water heater for DHW, as this project is all electric. Sound good?