Large really old hot water boiler.

Arthurjay

Has anyone encountered an old hot water boiler that had an integral, or internal air separator and expansion tank?
Don’t know the brand.

dopey27177

Yes. The boiler manufacturers still make an internal air separator. This usually has a 1/2" or 3/4" tapping where an automatic vent valve can be installed.

The best way to remove system air continuously is to have a system of piping that incorporates pumping away,

see attachment

Jake

Arthurjay

Yes, I am familiar with convention, and some boilers had air scoops. But have you seen any with an integral expansion tank?

Big Ed_4

What do you consider old ?

Steamhead

Pics please!

Alan Welch

On older systems the expansion tank was often located in the attic.

dopey27177

I found in my old files an easier to understand a pumping away drawing. This drawing is a bit easier to visualize pumping away.


Jake

EdTheHeaterMan

I installed a Hydrotherm Celtic wall-hung boiler 30 years ago that included a flat expansion tank tucked behind the boiler heat exchanger. There are two for sale on eBay right now.

Not a "Large" but this is the only one I ever encountered with the integral expansion tank

HVACNUT

There never was such an animal.
Internal scoop? Sure. No internal expansion tank though. Not mass produced anyway.

EdTheHeaterMan

@HVACNUT ... Never say never...
That orange thing in the picture is the expansion tank. It is not inside the boiler heat exchanger... it IS inside the white metal cabinet. I remember the front had a 18" wide x 30ish high white cover with a glass access door that reminded me of a microwave oven. My customer was very impressed with the "modern look" as it hung on the chimney in the kitchen.

This is the picture of the boiler that the customer looks at every day. (from the cover of the I/O manual)

@Arthurjay gave us a choice of internal or integral

I also remember that it was an import by Hydrotherm. I could not get parts after 15 years or so. I needed to replace the expansion tank and it was unavailable so I needed to add a #15 Extrol in the piping below the boiler. The customer was not happy with that repair so I had a sheet metal fabricator make an appliance white metal cover 18" wide that went to the floor to cover the piping and tank. Made it look like one large appliance from the floor to the top of boiler cabinet.

HVACNUT

> @EdTheHeaterMan said:
> @HVACNUT ... Never say never...
> That orange thing in the picture is the expansion tank. It is not inside the boiler heat exchanger... it IS inside the white metal cabinet. I remember the front had a 18" wide x 30ish high white cover with a glass access door that reminded me of a microwave oven. My customer was very impressed with the "modern look" as it hung on the chimney in the kitchen.
>
> This is the picture of the boiler that the customer looks at every day. (from the cover of the I/O manual)
> (Image)
>
> @Arthurjay gave us a choice of internal or integral
>
> I also remember that it was an import by Hydrotherm. I could not get parts after 15 years or so. I needed to replace the expansion tank and it was unavailable so I needed to add a #15 Extrol in the piping below the boiler. The customer was not happy with that repair so I had a sheet metal fabricator make an appliance white metal cover 18" wide that went to the floor to cover the piping and tank. Made it look like one large appliance from the floor to the top of boiler cabinet.


The topic is "Large really old hot water boiler ". That's what I was going by. Some mod cons have had integral expansion tanks crammed in them for years.

Big Ed_4

The steel York boilers from in the early 50's and maybe The GE's held air to use for expansion ..