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Replace tankless coil with tankless coil or go indirect?
I would like to appologize in advance. I'm sure this issue has been covered on here before but most posts i've found have been with regard to full system replacements or new installs.
Here's my situation-
The tankless coil in my 15 year old peerless oil burner has been having a hard time keeping up with the hot water demand of the bathtub/shower. When i had the furnace guy come by today to clean out the boiler and ready it for winter, i mentioned this to him. He recomended that i change my mixing valve but also stated that the poor preformance of the coil could be due to calcium buildup from the hard water that i have. I find this fairly beleiveable as my parrents weil mclain oil burner's tankless coil can keep up with a hot shower just fine.
So i asked him if i should replace the coil. He said the coils are very inefficient and recommended that i consider the indirect water heater instead. The coil change was $700 and the indirect heater option was $2000. He seemed confident that within 5 years the indirect solution would pay for itself.
From my research thus far, i've learned that one of the reasons that the indirect soultion is most efficient is that during the summer months the furnace can be shut down and will only have to start to heat the water in the storage tank. Now, my furnace guy stated that with the tankless solution i should set the low end of my controller to around 100 degrees in summer months as the cast iron boiler isn't designed to be shut down cold and brought up to temperature on a day to day basis - this seems to make sense.
My question is if it would really be worth it to pay the $1200 extra for the indirect solution if i have to keep my furnace at 100 degrees just to heat the water in the tank. I'm almost thinking i'm better off just replacing the coil. What are your thoughts?
Thanks in advance