Only warm, not hot water from our tap unless I slow the tap down.

Warm water indicates a element is probally in need of replacement. For warm water only more than likely the top element is bad. If you get a burst of hot water for a little while then your bottom one is probally gone bad. Best to replace both elements when changing one out due to not being to exspensive and you have to drain it down anyway.

To change out shut water of and turn power of to water heater open hot side on a faucet to allow heater to drain down so you can change out element.