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INSTALL REPORT:
CombiCor® Direct-Fired
Residential Water Heaters
When Harold Bruner got a chance to
design and install his first radiant floor
heating system, he took the time to do it
right. Harold is a professional engineer atMichel Sales Company Inc., in St. Paul,
Minnesota. Michel Sales represents
Bradford White Corporation in Minnesota,
Wisconsin, North and South Dakota and
the upper peninsula of Michigan. In addition
to Bradford White, Michel Sales had just
recently taken on the Rehau line of radiant
floor heating, and Harold attended their
training school. He realized right awaythat radiant floor heating had a lot of
potential in his area, one that is known for
long, cold winters. This type of efficient,
comfortable heating system should
generate high interest.
Harold’s first customer for radiant floor
heating was Mike Gusse. Mike was
formerly a buyer for J.H. Larson Electric,
a Bradford White distributor in the TwinCity area. He is, therefore, familiar with
Michel Sales. Mike was building a beautiful
new home in Zimmerman, Minnesota,
and he and his wife Sue wanted the best
of radiant living. Their spacious two story
home sits on a large rural lot in the
northwest outreaches of suburban
Minneapolis. The home is heated on all
levels with radiant floors. Radiant tubing
is placed in concrete on the basement
level, and within a poured floor
underlayment on all other levels. There is
generous use of hardwoods, tile and
carpeting throughout. The ceilings are
vaulted with an open staircase featured in
Case Study: Zimmerman, Minnesota
INSTALLER:
Harold Burner, Professional Engineer
Michel Sales Company Inc.,
St. Paul, Minnesota
www.bradfordwhite.com
Ambler, PA | 800 523 2931
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©2005, Bradford White Corporation. All rights reserved.
www.bradfordwhite.com
Ambler, PA | 800 523 2931
the main living area. Large windows
open up to a very pleasant woodsy view.
High quality windows and modern
construction in this home allows only
97,000 BTU per hour of heat loss in the
frigid Minnesota winter. With 4,800
square feet of heated floor, the heating
load averages about
20 BTU per square
foot. As an added
feature, the 950
square foot garage
is also heated with
radiant floor. This
feature not only
provides comfort in
the winter, but melts
the snow that falls
from the vehicle and
dries the floor to a
safe walking surface. All the heat for
this large home is provided by a Bradford
White 75 Gallon TTW CombiCor® in
series with a 75 gallon Bradford White
TTW water heater. When the heating
load is within the capability of the
CombiCor unit, both storage vessels are
heated by the CombiCor and the 1TW unit
does not fire. When the heating demand
reaches its extreme load, the 1TW is
staged in automatically without any
add i t ional
controls. In
the heart of
e v e r y
Comb iCor
lies the
u n i q u e
U l t r a C o i l
Heat Transfer
System. This
s p e c i a l l y
designed coil
a l l o w s
efficient heat transfer from the potable
water in, the tank to the heating fluid
within the UltraCoil. And because the
UltraCoil is a double-walled heat
exchanger, the use of glycol antifreeze
in the heating system is possible. The
use of glycol provides assurance that the
heating loops, especially those in the
garage, will not contaminate the antifreeze
protected heating fluid with the potable
water system. In the unlikely event of a
leak at the heat exchanger, the fluid
would be vented overboard to the
atmosphere. There is plenty of hot water
for domestic use in this system too. In
fact, if the domestic hot water demand
increases beyond the capability of the
CombiCor, the TTW will automatically
augment the potable water output. This
system provides a nearly endless supply
of efficient hot water. As an added safety
feature, the potable water temperature
output is protected with the adjustable
anti-scald valve that is provided with
every CombiCor. This Bradford White
heating system performed flawlessly
through the coldest part of the winter of
1996/97. Michel sales associate ChrisDeCosse (seen visiting the project) is
excited about promoting the system
directly to developers and to plumbing
and heating contractors throughout their
midwest sales area.
Basic Heating System Diagram requires expansion tank,
pressure relief, and a fill and flush station.
RETURNINOUT
MH
C
TTW®2 CombiCor®
Count On Bradford White
For Everything Hot Wate