Gravity hot water system

MorinMechanical

<span> I have a new customer who would like to relocate his expansion tank on a gravity hot water system to near the boiler in the basement. </span>

<span>The system consists of five radiators all on the same floor with the expansion tank located just above head height in the bathroom they are planning to remodel.</span>

<span>Can I simply just cut in an air scoop near the boiler with adding an auto feed regulator and backflow while capping off the old fill line at the main?</span>

<span>Is it critical to the placement of the air scoop?</span>

<span>How do I size the new compression tank? </span>

<span>Note: The customer has owned this rental for the past 5 yrs and claims they have never added water to the system. The expansion tank is empty and the boiler gauge shows only 3lbs pressure on the system if at all knowing how accurate these gauges can be. How is this possible or are just they just lucky?</span>

Steamhead

If it's still gravity

you'd have to use a pretty big air scoop. Might be time to go to forced circulation.



A basement tank will work fine, but you'll want to valve it off so it can be serviced. With only five rads, a 30-gallon equivalent would probably be OK.



That job needs a low-water cutoff too. They were real lucky.



What boiler is in there now?