My wife loves lot water when she wakes up so I leave it on propane all night. For the past 4 mornings there is no hot water when she runs the faucet, however as soon as she starts running it the heat...
You say the WH is Suburban, but with no model... If it is a demand heater, this is common. If it is not, then the heaters thermostat has developed a lot of hysteresis. This is not uncommon, but it usually takes a while. That control is not hard to replace.
And yes, a HW circulating pump can save you a lot of water.
Matt
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