My current hot water heater is about 10 years old and electric with an 80 gal tank (I think)......it's working fine but my wife wants a water softener and the install would be easier if we replaced the old water heater and tank with a tankless one (in that there would then be enough room in the mechanical room for both the tankless water heater and water softener). Aside from that consideration is it worth it to replace it with a tankless electric one from an energy efficiency standpoint? The kids have grown up and gone so hot water usage has gone down for showers and we wash clothes with cold......but we do have a big Jacuzzi in the master bath that's used a couple of time a week.