If your hot water heater is over about ten years of age, you should be considering the question: should I replace my hot water heater? There are a couple of telltale signs that you might need a new hot water heater. If it seems to be taking a long time for hot water to come out of a faucet, then that is an indicator of a potential problem. Likewise if there no longer seems to be enough hot water for someone to take a shower after someone else in the house has just done so, your unit might be wearing out. If rusty looking water is coming out of your hot faucet and the water in the cold faucet is clear, your unit may have started rusting out. Hot water heater Denver has more guidance on replacing hot water heaters in addition to other useful information.