I'm looking for recommendations for a cost-efficient solution for a DSH hot water buffer tank. I'm building a new home with a WaterFurnace 5 ton Envision. I plan to install a buffer tank in-line ahead of a 40-gallon natural gas water heater for finishing. I'd considered using a smaller electric water heater as the buffer (with electric disconnected), but I believe most water heaters have 2 ports (in & out) installed. I'm looking for a cost-effective solution...any suggestions/recommendations are greatly appreciated!! This forum has been a great resource for me during our planning process!