Martin Direct Vent Propane Wall Heater MDV20P – 20,000 BTU | Off‑Grid Wall‑Mount Heating Solution

Regular price $1,300.00
Shipping calculated at checkout.

Questions about this product

What room size will each model handle?

538 Square Feet

Do they need electricity and will they run during an outage?

No power required. They use a standing pilot with a piezo ignitor and a mechanical control, so they keep heating with the lights out.

What clearances and mounting height do I need?

Sides 6 in. Above 24 in. From finished floor 7 in to the bottom of the heater. Rear clearance: MDV8 is 25/32 in, MDV12/MDV20 are 1-3/16 in. Use the included wall template. Keep the exterior vent cap at least 24 in from any outside intersecting wall.

What comes in the vent kit and what wall thicknesses are supported?

Vent kit includes: external air-intake tube with enamel hood, internal flue-gas tube, indoor and outdoor mounting plates, plus a wall thimble on MDV12 and MDV20, with threaded rod and adjusting nut. Approved wall thickness is 4-1/2 in to 12-5/8 in. Thicker walls aren’t supported by the manual.

Can I convert propane to natural gas, and what about high-elevation derate?

These units are not convertible. Order the model for your gas type. Above 2,000 ft, reduce input by 4 percent per 1,000 ft.

Delivery and shipping

Orders are typically processed within 1 to 2 business days from the time of purchase, excluding holidays and weekends.

Shipping times and cost will vary depending on the product and your location.

On average:

Ontario and Quebec: 2 to 5 business days

Western Canada: 4 to 7 business days

Atlantic provinces: 4 to 8 business days

Northern or remote areas: Contact us to confirm

✔︎ Available for pickup at our showroom.
Canadian Off Grid — 4855 Union Road, Beamsville ON L3J 0T8

✔︎ Available to ship

Martin Direct Vent Propane Wall Heater MDV20P – 20,000 BTU | Off‑Grid Wall‑Mount Heating Solution

Heat up your off-grid space with the Martin Direct Vent Propane Wall Heater MDV20P. The industry leading wall furnace keeps your living or work space warm with a direct vent wall heater that includes a built-in thermostat to monitor your heat dispersion. The direct vent gas heater produces safe, clean energy that’s economical and aesthetically pleasing. Installation is made easy by connecting the heater to a gas fitter to heat your living space effectively with low maintenance required.The sleek fireplace design is constructed from heavy-duty die-cast aluminum for durability and reliability. Its versatile front grill allows for better heat flow keeping the back of the unit at room temperature preventing the wall from becoming soiled. When installing wall thickness cannot be less than 4.5 inches and cannot exceed 12.63 inches.

Key Features

• 20,000 BTU Heating Power – Comfortably warms up to 538 ft²  

• No Power Needed – Operates independently of electricity for off-grid reliability  

• Direct Vent Safety – Clean, safe indoor air with external combustion and exhaust  

• Built-In Thermostat – Automatically adjusts flame height for consistent room temperature

• Heavy-Duty Die-Cast Construction – Built to last in rugged environments

• Clean Wall Protection – Rear of the unit remains cool to avoid wall discoloration

• Simple Installation – Fits wall thicknesses from 4.5” to 12.63”

• Low Maintenance – Minimal upkeep with efficient, clean combustion

• Larger Footprint – 26” (W) x 8 1/4” (D) x 22 5/8” (H) | Weight: 47.4 lbs

• Color – Sleek silver and black

• Warranty – 1-Year Limited Manufacturer’s Warranty

Why Choose This Heater?

✔ Ideal for Off-Grid Living – Perfect for larger cabins, workshops, or off-grid homes that need more heat.

✔ Wall-Mounted Convenience – No bulky floor unit; just clean, efficient wall placement.

✔ Certified & Safe – CSA-certified for use in Canada and the US, with safety-focused direct venting.

✔ Set It & Forget It – With its built-in thermostat, the MDV20VP adjusts automatically to your desired comfort level.


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Price
Price
Regular price $1,040.00
Regular price $1,140.00
Regular price $1,190.00
Regular price $1,300.00
Regular price $1,430.00
Type of Gas
Type of Gas
Propane
Propane
Propane
Propane
Propane
Thermostat
Thermostat
Yes
Yes
Yes
Yes
Yes
Heating Capactiy
Heating Capactiy
194 ft2
323 ft2
323 ft2
538 f2
538 f2
Glass-cermaic
Glass-cermaic
No
No
Yes
No
Yes
Perfect for
Perfect for
Small cabins, bunkies, or compact offices.
Medium-sized living rooms or workshops.
Medium-sized living rooms or workshops.
Larger open spaces or cottages
Larger open spaces or cottages.