and the units with one valve and a check valve can be an issue with hot water temperature. the check valve is nonlinear restriction and if you experience water temp change when you change the flow rate, like when another faucet turns on, or you turn the shower from full flow to reduced flow, your experiencing a check valve that exhibits the variable restriction. Solution is to pull it out and put in a two valve WH bypass. problem solved, water temp is constant over a wide range of water flow.
Dutchmen sport: this is what our 295RE had, and I had temp problems with various flow rates, went to the old style two handle bypass, problem solved.