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I have a Bradford White combination tank for domestic hot water and heating (air handler/fan coil). Looking to replace the tank, e.g., another Bradford White, Polaris, A.O. Smith Vertex. What’s best? Or should I consider tankless combi? It’s a two story townhouse in Southern Ontario (zone 6A?), approx 1100 sq ft. The tank is in a bedroom closet on the second floor.