About Entran II
Entran II is a rubber hose used for
radiant in-floor heating systems and snow melting. It was manufactured
by Goodyear Tire & Rubber for Heatway Systems from 1989-1994.
A plasticizer was added when the tube was manufactured to keep
it flexible. This plasticizer, however, began to leach out
of the rubber when it was exposed to high temperature heating
water. The tube then hardens and cracks, causing complete failure
of the heating system. Entran II tubing was installed in approximately
10,000 homes throughout the U.S.
How do I know if Entran II is installed in my house?
There are two places where Entran II may be visible for inspection:
at the boiler and at remote manifold locations in the house,
generally behind access panels in closets. In some cases the
Entran tubing is not visible and sheetrock may have to be cut
to access it. If you have radiant heat in your Santa Fe house,
and it was either built or remodeled between 1989-1994, there
is a very high probability Entran was installed.
The tubing was bright orange when it was first installed but
may have turned a dusty, dark orange due to deterioration.
It is clearly labeled “Entran II.” There is also an “Entran
3” installed after 1994, but no problems have been reported
with this product.
How can I determine the condition of Entran II tubing
installed in my home?
We can evaluate the condition of Entran II tubing with a durometer. This
device is designed to measure hardening in rubber products.
If the Entran II is visible, this is a simple test that will
give you some idea of the condition and longevity of the tubing.
We've tested dozens of systems in the Santa Fe area. Some are
nearly “good as new,” and some are only months away from failure.
Most are somewhere in between.
Is there any way to slow the deterioration of Entran
Yes. A two temperature delivery system can be installed. A
boiler needs to operate at 140 degrees or hotter to prevent
harmful condensation in the combustion chamber. By installing
a mixing valve, secondary pump and control wiring, we allow
the boiler to operate at the proper temperature, but deliver
water to the Entran tubing as cool as 110 degrees. This will
significantly increase the life of Entran II tubing. However,
the house may be difficult to heat during the coldest
weather. We've heard about certain chemicals that some contractors
are adding to boiler water, but we do not recommend
Could the Entran II tubing installed in my house be
leaking without me knowing it?
Yes. In a typical slab-on-grade house about 99% of the Entran
II tubing is embedded in the slab. Any water could very well
be absorbed by the soil with no water apparent in the house.
If you're in the City, you may or may not notice a very gradual
increase in your water bill. If you're on an unmetered water
well you could be losing water and not know it.
There's a simple way to test for leaks, simple enough for
you to do without assistance from a professional. Just turn
the water feed off to the boiler and monitor the boiler pressure
gauge. If the pressure remains constant you don't have a leak—if
it drops, you have a leak. If you're not comfortable doing
this test yourself, or if you need some assistance over the
phone, please call our office at 471-4221 (out of town:
© Copyright 2004 John M. Onstad