i have a 16x16 open hole what door do i need?

For anyone else asking this question, look on Gerard’s website. There is a downloadable document that shows and explains the door types. If you currently have a 6 gallon tank heater, there are two sizes. If you currently have a 10 gallon tank heater, there is only one door type.

Can this be used year round in nc where outdoor temps can dip down to 0f? the inside of camper would stay heated.

Big negative on that one. We own a RV shop in MI and all it takes is a couple hours below freezing and they will crack the fitting at the flow sensor particularly the brass around the set screw breaks. Not a big deal to fix $80 for parts depending on how bad. But I digress for year round use there are vastly better options out there. (We're @ over 100 of these repairs completed)

Does it run on both electric or propane

Unit uses propane for fuel to heat water and 12 volt for control system, ignition and burner blower. 12 volt consumption is mainly blower motor when operating

Does this have a winter use device (wud) ?

As long as its operational it has an "anti-freeze" and it will kick on to warm the pipes within the unit only it won't cycle all of your system and keep it from freezing if your basement isn't heated but it will protect itself if you leave it on See the owners manual on their web site

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Description

🔥 Stay warm, stay smart — the future of RV water heating is here!

SMART TEMP CONTROL - Onboard microprocessor ensures consistent water temperature, no cold spots or scalding surprises.
FUEL SAVVY EFFICIENCY - Consumes half the LP gas compared to traditional 6-gallon tank heaters—save money and fuel.
WHISPER QUIET COMFORT - Brushless motor runs under 3 amps for nearly silent operation—peaceful travels guaranteed.
INTUITIVE DIGITAL PANEL - Adjust temps from 95°F to 124°F with easy-to-read controls and real-time diagnostics.
ENDLESS HOT WATER ZERO WAIT - Continuous flow at 42,000 BTUs keeps your RV plumbing always ready.

The GIRARD Tankless RV Water Heater delivers powerful 42,000 BTU continuous hot water with ultra-quiet 12V brushless motor operation. Its onboard microprocessor maintains precise temperature control while consuming half the LP gas of traditional tank heaters. Featuring a digital user control panel for easy temperature adjustments and diagnostics, this lightweight, wall-mounted unit is designed for efficient, reliable RV comfort.

Specifications

Brand	GIRARD
Product Dimensions	12.5"W x 12.5"H
Special Feature	Lightweight
Color	Gray
Wattage	42000 watts
Voltage	12 Volts
Maximum Temperature	124 Degrees Fahrenheit
Heat Output	42000 British Thermal Units
Efficiency	Half the fuel consumption of traditional 6-gallon tank water heaters
Style	Indoor Installation
Mounting Type	Wall
Is Electric	No
Manufacturer	GIRARD PROD
Item Depth	13.75
UPC	846611000561
Global Trade Identification Number	00846611000561
Part Number	2GWHAM
Item Weight	22 pounds
Item model number	2022107534
Item Package Quantity	1
Special Features	Lightweight
Included Components	Girard 2GWHAM On-Demand GSWH-2 Tankless RV Water Heater
Batteries Included?	No
Batteries Required?	No

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