Hydronic

(Hot Water)

Water is heated by the diesel fired burner system and circulated
through a closed loop of tubing or hoses to the area requiring heat.

In the area to be heated you can install convection type radiators* or the most common installation is the fan forced radiator system similar to the heating system in your car.

The fans on each fan radiator unit can be controlled with a thermostat to give you automatic zone controlled heating.

These units can also be installed with special heat exchanger units to heat domestic hot water for showers or the galley.

Another option is to install a water to water heat exchanger between the main engine and the heating loop. This arrangement can allow the boat to be heated by the main engine when underway.

To see more information on specific Espar models, just click on the model number

Note:  
B = Boost Output (intermittent rating) 
H = High Output (continuous rating) 
M = Medium Output (when maximum is too much & low is not enough)
L = Low (Minimum Output)
* Convection type radiators are large and are not practical on most boat installations
** Heater only + Pump Current

Forced Air

Air is heated by the diesel fired burner system and carried via high temperature flexible ducting to the areas requiring heat.

The distribution of heat is controlled by using various duct sizes and in some areas adjustable heat registers are useable to regulate hot air flow.

The forced air systems utilize one centrally located thermostat to control the operation of the heater, very similar to a forced air system in a home.

Btu output rating

Amp Draw 12v

7,500 Boost
6,150 High
4,100 Medium
2,900 Low

2.8 Boost
1.9 High
1.0 Medium
0.7 Low

13,650 Maximum
10,200 High
 6,800 Medium
 3,400 Low

3.3 Boost
2.0 High
1.1 Medium
0.6 Low

18,800 Boost
16,400 High
 9,200 Medium
 4,100 Low

6.7 Boost
6.7 High
3.3 Medium
3.3 Low

27,300 High
11,900 Low

9.6 High
9.0 Low

Note: 
B = Boost Output, intermittent rating. 
H = High Output, continuous rating  
M = Medium Output, when maximum is too much & low is not enough
L = Lowest Output
(All hot air models turn off when no heat is required to maintain cabin temperature)

Method 1

Cubic Foot Area to be heated - Measure the boat interior and use the guide below to determine your multiplier.

Caution - when using this method of estimating the heat requirements, it is important to 

Accurately measure the INTERIOR VOLUME to be heated.
     Do not measure the box that the boat came in.
     Do not measure the space taken up by cabinets, bunks or other permanent structure.

Geographic Location

Limited Winter
Use

btu's per cubic foot

Winter
Cruising 

btu's per cubic foot

Live Aboard
All Year 

btu's per cubic foot

Example: c.f. area to be heated = 1000 
 Live aboard in Washington = 11 

Estimated btu's: 1,000 x 11 = 11,000 - Heater size = Airtronic D4 air or D4W water

This link will take you to a side by side explanation of  the version choices
or
click on the specific links below

Espar Grand Mariner Heaters
Espar Mariner Heaters

CAN I INSTALL IT MYSELF?

Yes!!  Boat Electric has configured Espar's universal models for easy marine installation.
With the simplified instructions installation is easier then ever, requiring only basic mechanical skills.

If you have a question your local dealer is just a phone call away.

West Coast Espar Dealer List

Specific installation instructions are not currently provided on our web site.

e-mail us with your requirements (using the sizing guides) and we can furnish you with 
current pricing for your heating system requirements.

West Coast Espar Dealer List

Maradyne - Heat from Your Engine
MSR Water to Air heat exchangers
King Stainless Steel Electric Heaters

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