I live in TX and have a GE hybrid water heater. It has significantly reduced my electric bills. The problem is, especially during the cooler months that it won't keep up unless it uses the electric heat. Now I have added in a 70 gallon whirpool tub and even in the summer it won't keep up (50 gallon WH). I have been contemplating issuing a spare 2.5 ton condenser I have at the shop to build a much higher recovery rate WH. Anybody tried this? Pitfalls? Struggles?