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MARTIN ®    LIMITED WARRANTY FOR MDV SERIES GRAVITY VENT GAS HEATERS 

This appliance must be installed by a licensed, authorized service technician or contractor. The installation must be done in

accordance with the installation instructions provided with the product and all local and national building and fire codes.
Any defect or damage caused by any alteration or the use of unauthorized parts or others than original parts void this warranty.

This Limited Warranty does not cover any scratches, corrosion, warping or discoloration caused by over firing or exposure to 

chemicals or ones in the environment or the use of abrasive and/or chemical cleaners. This warranty does not cover damages

caused  by misuse, alteration, neglect, improper installation, lack of maintenance, accidents or failure to perform normal and

routine maintenance and inspection, accident during transportation, power failures, downdrafts, or venting problems.
This warranty is limited to the repair or replacement of parts at no charge which prove to be defective under normal domestic 

use and service and which on examination shall indicate to Bismar’s satisfaction they are defective. Only original parts from the 

manufacturer must be used for repair or maintenance. The manufacturer may require the return of defective part or that digital 

pictures be provided to support the claim. 
Defective parts will be replaced free of charge during the warranty coverage from date of purchase with reasonable proof of 

purchase and date. Parts returned for investigation must be shipped  “Prepaid”. Parts under warranty will be returned to the 

purchaser “Prepaid”. This warranty does not cover labor charges for replacement or repair of parts under the warranty coverage 

of warranted parts. No labour costs wether during part warranty coverage, or travel expenses, is covered.
Repair work covered by the warranty, executed at the purchaser’s domicile by an authorized qualified technician requires the prior 

approval of the manufacturer. Any service call related to an improper installation is not covered by this warranty.
There are no other expressed warranties except as set forth herein and any implied warranties of merchantability and fitness in

duration to the period of coverage of this expressed written Limited Warranty.
Bismar will not be liable for any special or indirect cause or consequence related in connection with the sale, installation, use,

damage, return or replacement of its equipment, and no such representations are binding on Bismar incorporated.
Some states, provinces or jurisdictions do not allow the exclusion or limitation of incidental or consequential damages or limitations

on how long an implied warranty lasts, so the above limitations or exclusions may not apply to you. This warranty gives you specific

rights, and you may also have other rights that may vary from state or province to province.

If unit or defective parts are required to be returned, please contact our customer service for a return 

authorization number prior to ship. Any merchandise shipped to our plant without an authorization will be

refused automatically and returned to sender. Refer to coordinates on front page of this manual. 

CONDITIONS AND EXCLUSIONS

rev. 6/16

Bismar incorporated warrants material and workmanship of your new Martin ®  Gravity Vent heater against defects. This Limited 

Warranty is effective from original date of purchase and applies to the original purchaser of the heater provided it was purchased 

through an authorized Martin ®  products dealer. This factory warranty is non-transferable and may not be extended in any way by

our representatives. This warranty covers new products only which have not been altered, modified nor repaired since shipment 

from the factory.

This LIMITED WARRANTY applies to normal residential use only.

LIMITED WARRANTY APPLICATION AND COVERAGE :

-  1 year coverage from defect and/or workmanship on all parts.

-  Original owner: Lifetime replacement coverage of the combustion chamber: (against deterioration of weld integrity or defects 

   and castings).

-  Not covered: All labour costs.

Shall your heater or a component be defective, contact our customer service and make sure you have the following information 

necessary to your warranty claim treatment:
    -  Bill of sales and name of dealer. Serial number and model number as indicated on the rating plate on back of unit.

       Nature of the defect and any relevant information.

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Summary of Contents for MDV12N

Page 1: ...other gases WARNING If the information in these instructions are not followed exactly a fire or explosion may result causing property damage personal injury loss of life INSTALLER Leave this manual wi...

Page 2: ...ly durable products for your maximum comfort and satisfaction Install and use the heater with care The installation must conform with local codes or in the absence of local codes use the latest editio...

Page 3: ...t and hot air outlet 12 Do not spill water over the heater as it may cause corrosion 13 Allow heater to thoroughly cool before servicing 14 Input ratings are shown in BTU per hour and are rated for el...

Page 4: ...MDV8 2 cm 25 32 in MDV12 20 3 cm 1 3 16 in 61 cm 24 in 15 cm 6 in Clearances to combustible surfaces Rear MDV8 2 cm 25 32 in MDV12 20 3cm 1 3 16 in Sides 15 cm 6 in Above 61 cm 24 in From floor 18 cm...

Page 5: ...ible wall in both indoor and outdoor Floor level Fold here 5 The following diagrams serve as a reference for the installation of your heater with the ventilation provided with the unit The template th...

Page 6: ...s inlet 3 8 NPT 380 mm 15 230 mm 9 1 16 190mm 7 1 2 40mm 1 9 16 112mm 4 7 16 180mm 7 1 8 115m m 4 1 2 25mm 1 390mm 15 3 8 575mm 22 5 8 92mm 3 5 8 92mm 3 5 8 92mm 3 5 8 92mm 3 5 8 490mm 19 5 16 215mm 8...

Page 7: ...inlet 3 8 NPT 660 mm 26 270 mm 10 5 8 300mm 11 13 16 110mm 4 5 16 390mm 15 3 8 40mm 1 9 16 112mm 4 7 16 180mm 7 1 8 160m m 4 1 2 25mm 1 390mm 15 3 8 118mm 4 5 8 118mm 4 5 8 118mm 4 5 8 118mm 4 5 8 490...

Page 8: ...unting plates with screws provided MDV12 MDV20 heaters only Assemble the wall thimble 4 Prepare the rear spacers with mounting screws The wall s thickness cannot be less than 4 1 2 11 5 cm nor can it...

Page 9: ...g 4 IMPORTANT The appliance s vent cap should be at least 24 in 61 cm from any outside adjacent or intersecting wall IMPORTANT The appliance s venting system should be inspected at least once a year a...

Page 10: ...Gas connection Mounting Details Gas valve 18 cm 7 41 cm 16 1 8 MDV20 24 cm 9 7 16 MDV12 21 cm 8 1 4 MDV8 20 cm 7 7 8 See mounting details Putty 11 cm 4 5 16 Thimble only for models MDV12 MDV20 Drywall...

Page 11: ...appliance 10 000 BTU hr 3kW and 100 000 BTU hr 30 kW 36 inches 91 cm for appliance 100 000 BTU hr 30 kW 6 feet 1 83 m 7 feet 2 13 m 12 inches 30 cm 12 inches 30 cm 6 inches 15 cm for appliance 10 000...

Page 12: ...reater diameter to allow full gas volume to heater Excessive pressure loss will occur if the pipe is too small A manual shutoff valve union and plugged 1 8 NPT pressure tapping point must be installed...

Page 13: ...o the next step Find the pilot by looking through the viewing window on the front of the unit Press the knob down lightly and turn counterclockwise to the t o l i P t o l i P Position Press down and h...

Page 14: ...ve the two 2 M4 screws that hold the pilot in place Clean with a vacuum cleaner or use a can of compressed air To Remove Burner Loosen the gas line from the burner on the right side of the unit On the...

Page 15: ...15 Fig 5 Fig 7 Fig 6 Correct Flame Pattern Correct Flame Pattern Incorrect Flame Pattern...

Page 16: ...16 PARTS LIST MDV8 NATURAL 118 PROPANE 85 P ITEM DESCRIPTION QTY...

Page 17: ...17 PARTS LIST MDV12 MDV12V View NATURAL 137 PROPANE 104 P DESCRIPTION ITEM QTY...

Page 18: ...NATURAL 178 PROPANE 131 P ITEM DESCRIPTION QTY PARTS LIST MDV20 MDV20V View 18...

Page 19: ...rranties except as set forth herein and any implied warranties of merchantability and fitness in duration to the period of coverage of this expressed written Limited Warranty Bismar will not be liable...

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