[/quote]gwjwbw wrote:All the trouble I went thruto get the nuts off and broke 3 out of 8, it be alot easy to have a flange weld in, I rather cut the nut and bolt out thru break another stud, anyway, thank for letting me know about the coil size, Gerardcoal berner wrote:[quote="gwjwbw"]The opening on the boiler for DHW coil, I have a 5 gpm coil now and going with a 7gpm, do I need to make the opening bigger?
I snaped off 3 of the 8 bolts that hold the coil, now going to cut them all out and weld a flange onto the boiler and use nut and bolt for the coil
Why not Just drill out the broken studs and re thread the holes and put new studs in then there is not need for a flange
and either size coil will fit right on .
Should of put the studs on the New parts list .
Well it it your do what you want Just make sure the welder knows what he is doing .
BTW The efm boiler is 5/16" boiler Plate steel not Just plain 1/4 " steel plate .
Remember you dealing with a hot water pressure vessel Be Careful Make sure someone knows what there doing.
Make sure you make the flange the right size so the coil fits bolt pattern