I have an oil fueled boiler that supplies the hot water by coil (currently no stand alone hot water tank). It simply can not maintain constant temps or supply enough hot water. So I'm thinking of installing either an indirect hot water tank that abandons the boiler coil for the coil surrounding the new tank OR just a hot water storage tank that will be replenished by the existing boiler coil. Looking to get a feel for the pro's and con's for each to make a decision.

Any comment or experience with one or the other would be helpful.