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Marine Catalog
Marine Catalog
Sure Marine Service, Inc.
5320 28th Ave. N.W.
Seattle, WA 98107
(800) 562-7797 (206) 784-9903
www.SureMarine.com
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SMS Catalog - Contents
(800) 562-7797
(206) 784-9903
Sales@SureMarine.com
Page 2
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* Designates heaters for live aboard applications when properly installed.
Air Heater / Boat Size
Heater Sailboat Powerboat
AT 2000
22' - 28'
20' - 24'
AT 3500
28' - 34'
24' - 30'
AT 5000
34' - 38'
30' - 34'
HL 60*
34' - 42'
34' - 38'
HL 90*
42' - 46'
38' - 42'
Water Heater / Boat Size
Heater Sailboat Powerboat
TSL 17
34' - 38'
30' - 34'
Thermo 90
38' - 42'
34' - 40'
DBW 2010*
42' - 48'
40' - 47'
DBW 2020*
48' - 56'
47' - 58'
DBW 300*
56' - 62'
58' - 65'
© 2006 Sure Marine Service, All Rights Reserved.
April 6 th , 2006
The content of this catalog is furnished for informational use only. It is subject to change without notice. Sure Marine Service assumes
no responsibility or liability for any errors or inaccuracies that may appear in the content of this catalog. The text, drawings and other
artwork are not to scale and are simply intended to be guides to aid in your selection process. They do not replace installation or
owners manuals.
(800) 562-7797
(206) 784-9903
Sales@SureMarine.com
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WHY THE RIGHT SIZE IS IMPOR T ANT
Many factors are involved when choosing the right heater for a particular boat. Merely purchasing a heater based
on its compact size for the purpose of “taking the chill off” can be a costly mistake in the long run. A heater that
is too small for a boat will work hard to meet the demand called by the thermostat. Even though the heater may
only keep the boat at a minimum temperature for comfort, it will run excessively and cause maintenance problems
due to wear. Smaller heaters can be attractive in boating because they take up a little less space. Many boaters
are willing to accept a small temperature difference in exchange for that extra room, without looking at the extra
costs in fuel and maintenance due to over working the heater. The wear that is caused from this excessive
running would not be covered under warranty.
Bigger is not always better. Some customers have expressed interest in installing the largest heater possible,
thinking it will cut down on operation and wear. If a heater is oversized it will be prone to “short cycle”. Short
cycling is when the burner section does not run long enough for its proper heat-up. Like engines, burners must
be run up to operating temperature and there is a minimum run time for this to occur. If the burners optimum
running temperature is not reached, the unit will run inefficiently and it will be prone to carbon buildup which can
lead to extra maintenance.
SIZING A BOA T
Considering these issues, choosing the right heater is obviously very important. Sure Marine Service offers a
basic quick reference chart to guide an installer in the right direction. If there is concern about whether or not a
heater is right for a boat, there are formulas that can be used to figure out the requirements. The internal volume
of the spaces being heated should be multiplied by 12 for a sailboat ((length x width x height) x 12), and by 15 for
a powerboat ((length x width x height) x 15). These numbers will give a round number of the BTU requirements,
but other factors must be taken into consideration. When considering a heater, the construction of the boat must
be considered as well as its size. Windows are sources of heat loss that need to be considered. If a main saloon
has multiple windows the amount of heat for that space should be raised. Whether or not a boat is insulated is
another factor. If your boat is not well insulated you should raise the heating requirements. Be sure to consider
these variables if a boat size rests between heater sizing specifications. We have included tables to assist you
in your sizing decision.
LIVE-ABOARDS
Properly sizing a heater for a live-aboard application is crucial. Air heaters should not be used. Since there is no
way to store household temperature warm air, an air heating system must fire its burner every time heat is
needed. This leads to excessive run times and maintenance issues.
In general, live-aboards and larger boats require a water heating system using a DBW 2010 or above. The DBW
series are the only heaters in the Webasto line that we advise for such installations. These systems are designed
to maintain a larger supply of hot water which provides a thermal mass to store heat. This cuts down on burner
run time while providing good heating system performance.
A properly sized and installed heating system will run better and cost less in the long run. By selecting the right
heater for your application the system will work well and the owner will be happy.
(800) 562-7797
(206) 784-9903
Sales@SureMarine.com
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REAL ™
Fan Heaters
The goal of the technicians at Sure Marine Service is to
design the REAL with enough flexibility to fit the needs of
any installation. Drawing on decades of installation and
servicing experience, the REAL has been refined to provide
simplified installation and reliable performance.
Every REAL is fitted with ¾” NPT on the hose connections
to allow for different sizes of hose barbs or different types of
connection. If your engine requires a 5/8” hose, the REAL
can be adapted to a 5/8” hose barb. If you are using ¾”
PEX for your heating system, the REAL can be fitted with
¾” PEX connections. Contact a SMS salesperson for details.
PEX Tubing
Rubber Hose
Unlike any other fan heater, the REAL can be mounted with
the hose barbs on either side. Bleeder fittings are installed
on both hose connections to allow for air bleeding and the
footprint sold with each heater can be mounted on either
side.
New! Bulkhead mount bracket for 5000, 5200, 6000,
and 6200 Series fan heaters.
Every REAL model is available in 12 or 24 volt DC
configurations. The use of box style and squirrle cage fans
allows you to tailor your system to meet your sound and air
volume needs.
Every flush-mount fan heater comes complete with a grille.
You can specify a white, black, brass or stainless steel grille
to match the interior of your boat.
(800) 562-7797
(206) 784-9903
Sales@SureMarine.com
Page 5
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