Return Insulation

dlipter

My return is 1 1/2" OD copper pipe. The old insulation has crumbled. Is it important to insulate the return?

Would polyethylene pipe wrap be suitable?

It is rated to 180 deg F.

EBEBRATT-Ed

Much more important that the steam line are all insulated.

Be careful with the return line insulation it could contain asbestos depending on it's age

If you reinsulate the returns I would use 1" fiberglass pipe insulation.

dlipter

Why fiberglass?

Boiler Talk

Well, if you have a steam system fiberglass is the only stuff that will last. Foam will degrade. 1 inch fiberglass will save energy more than 1/2 inch fiberglass too. 1 inch probably is optimum for the cost.