Click here to Find a Contractor in your area.
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit

Arco Gravity boiler

1906 water boiler converted to natural gas.

My client purchased this home under the assumption boiler worked.

I found it has a water gauge on top left and a small possibly broken temprature gauge on top right.

There is a floor standing expansion tank with no vents that I can find.

The only control other than a heating thermostat and thermocouples on the gas valve.

Shouldn't this have a Aquastat and low water cut off?

What water pressure should we have.


  • kcoppkcopp Member Posts: 2,744
    More than likely...

    It is a gravity hot water boiler... Low water cutoffs and aquastats are a new invention compared to the age of the boiler. A stack switch was used to control the temperature. A new boiler is prob. the way to go.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!