Hot water runs out and takes hours to replace, boiler and storage tank 2 years old never had prob before, never ran out. Look and saw small expansion tank could be full of water would this affect HW tank

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Look and saw small expansion tank could be full of water would this affect HW tank

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The expansion tank won't affect the operation of tohe water heater . However, It sounds like the bladder;s ruptured and it needs to be replaced.

Before can give yo0u a answer I need more information. Gas or electric heater? How old? Did this happen all of a sudden? Any more details? Back to you, Tom