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I have a tankless coil in my oil fired boiler. i dont have much experience with this hot water setup. Is it normal that we are not able to take a bath with this setup. i have looked at some things with coils that if they are not working right there will be a lack of water pressure with the hot water. I dont have any pressure problems.
 

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have the coil cleaned, usually ultrasonic does a good job and see if that helps, also make sure boiler is set at proper temp( 170 to 180), if set too low it wont make enough hot water, if all that doesnt give you enough you can set up a storage tank with a circulator and aguastat to give you 40 or 50 gallons of hot water to draw from as the coil keeps up..or put a separate water heater in all together..
 

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Ayuh,.... When I ditched the electric water heater, 'n went to the coil in the boiler, I had to put a flow reducer in-line with it,....

At full flow, 3/4" water line, that water moves to fast, 'n don't heat,....
A 3 gallon a minute flow reducer cured it, 'n I now have unlimited hot water,...
 

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I had one of these on my homes original boiler. Never worked for us after we bought the house. Worked fine for the little old lady who lived there alone. My wife and i along with a, at the time, young daughter could never have enough hot water. I disconnected it and put in a standard 40 gal water heater untill I had time to upgrade the heating plant. Once that was dome, I zoned a 50 gallon boiler mate to the new boiler and never looked back. My, now, teen age daughter could not run that thing out of hot water no matter how hard she tried.
 
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