I have a 6 zone hot water / forced air hybrid heating system. Most of the actual baseboard system is 1958/1980, but works fine. In 2000 I put in a new boiler, AC, and a forced air furnace that gets its heat from hot water flowing through it from the boiler (in addition to the zones). I also have a 36 gallon, supposedly unlimted domestic hot water system that also uses heat transfer from the boiler to the water. Supposedly it takes 8 minutes to heat a whole tank. Wrong. I had to put in a backup 40 gallon electric tank inline which supposedly just stores more hot water. The limitless tank is cranked up to the maximum, supposedly dangerous, heat level.

Still, if my son has a shower and my wife a bath, we have to wait almost 2 hours before there is hot water again, and no, it is not a 30 mintue shower. Essentially one full tub exhausts the supply. I am thinking of putting a large gas fired hot water tank in line.

I have had other hot water heating systems before and never had a shortage of hot water!

Any ideas of other solutions?

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Originally Posted by bcroker

I have a 6 zone hot water / forced air hybrid heating system. Most of the actual baseboard system is 1958/1980, but works fine. In 2000 I put in a new boiler, AC, and a forced air furnace that gets its heat from hot water flowing through it from the boiler (in addition to the zones). I also have a 36 gallon, supposedly unlimted domestic hot water system that also uses heat transfer from the boiler to the water. Supposedly it takes 8 minutes to heat a whole tank. Wrong. I had to put in a backup 40 gallon electric tank inline which supposedly just stores more hot water. The limitless tank is cranked up to the maximum, supposedly dangerous, heat level.

Still, if my son has a shower and my wife a bath, we have to wait almost 2 hours before there is hot water again, and no, it is not a 30 mintue shower. Essentially one full tub exhausts the supply. I am thinking of putting a large gas fired hot water tank in line.

I have had other hot water heating systems before and never had a shortage of hot water!

Any ideas of other solutions?

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You should have a heat lost calculation , for the house + 40 gal hwh, when you put in the new boiler. Whenever you Don't have enough hot waters, was the main boiler running? It would not take no more than 30 min to heat up the 40 gal water tank, do you have the same problem in the summer.. how big is your current main boiler?. 125000+?