Capping a Tankless Coil

JC_5

I currently have an Axeman Andersen Boiler (originally oil, now gas)with a tankless coil for DHW. To improve the DHW situation, I am considering adding another zone and an 80 gallon indirect tank. I have been doing lots of research on this an it seems simple enough to do on my own, I just have one question that hasn't been clearly answered by what I read; the pipes into and out of the current coil, are they simply capped off or are they treated differently (although I dont see how)
I am hoping to avoid this situation althogether by replacing the heating plant as I add the indirect tank, that is a budget issue though.

Guy_6

caps

I would not recommend capping the pipes of the defunct coil, as you may have pressure issues on the coil if capped. I have always left them open, or removed the coil and put a blank plate on the opening.

ChasMan

I heard if you try and remove the old coil you risk putting the boiler into the FUBAR pile due to bolts breaking off etc. Do you think this would happen even with My lil Slant Fin with stainless steel bolts?

J.C.A._3

Which is why.....

All tankless designs should have studs and BRASS nuts. Any coil that has ever been installed by me always geta a generous helping of an anti-seize compound also.

I would just abandon the coil in place. No way should it be capped. That's just asking for trouble. As long as the gasket is holding, it should be fine. Chris

soot_seeker_2

Stainless

Stainless steel bolts usually come right out. It would be nice to take the old coil out, as a leak down the road in it can give a headache. Don't go throught too much trouble if you dont have a blank plate and gasket. You may buy them only to find the bolts woun't come out. Stainless usually does though.

Don't cap the old coil! Any moisture in it that flashes to steam will make a bomb. BOOM!

How about running the supply water through the coil to preheat it? We do that when adding a gas hot water heater to a job that formerly had a coil.

Just a thought.

Long Beach Ed

David Sutton_6

23 yrs.....

and hundreds coils change and repaired and have not tossed a single one. if you willing to tackle a project like that you should be tooled up and ready for anything, Grinding wheels, taps and dies drills with GOOD bits properly sized, i have a welder with a portable rig i can call if realy needed. Have thing things in place and rady to go .I think they should all be replaced with indirects but there still here and need to be worked on by pro's....David

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chapchap70_2

I agree with the other postings

I was just reading an old Crown boiler manual. The manual states that if you abandon the tankless coil, the coil should be drained and left open to atmosphere.

JC_5

Drain and left open, I think that is the way to go. This unit seems to be way too "intergrated" into the boiler to mess with. I really don't want to have to take off the shroud and get inside and deal with rusting parts and the like.
I have been trying to find literature on this boiler, I cant find anything. I have time til I do this though.. I am not going to even attempt this until the weather warms and I dont need the heat(mid April or so)

bob young

relief valve

if you cap the coil, make sure you have a tee with pressure reliel valve on the connection.