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Water/Oil Bath jacketed boilers usually come with electric heating elements in the jacket layer, heating elements heat the heating fluids(can be oil or water) then heat the liquids in the interior tank, creating an uniform,consistent heating. There’s lower risk of scorching as the elements are not in direct contact with the liquids in the interior tank.
What Heating fluid: It’s recommended to use Propylene glycol(usually a mixture of 30% to 50% glycol with water) as glycol solutions have a higher boiling point than pure water, which can allow systems to operate at higher temperatures with less vapor pressure
How much to fill: When using glycol/oil as heating fluid the heating fluid’s level can be 3/4 the depth of the wash, leaving some space for oil to expand.
Using a proper PRV(pressure relief valve) or Leaving the filling port open: Some jacketed boiler may not handle as much pressure as steam boiler or can't handle any pressure, contact us if you plan to use your own PRV, using a PRV that's higher than your boiler's pressure ratings would cause damage.
Be aware of The Danger of a Vacuum: If the jacket has a PRV, the condensed water may create a vacuum, make sure to open the valve to release the vacuum as it could damage the boiler as much as pressure.
If your boiler is double jacketed without the built-in insulation layer, it’s a good idea to insulate the boiler with insulation blankets(such as epdm sheets, ). It can reduce the energy loss and the heat up time.
If the boiler can handle some pressure, use a proper PRV(pressure relief valve)for the jacket to reduce air leaks, some of our boilers can’t be pressured please consult with us before using the PRV.
When using water as heating fluid(the boiler must can handle pressure), it’s most effective when the water is just enough to protect the elements, leaving as much space for steam to heat the tank.