An Espar heater is one of the best decisions you can make for van comfort, especially if you’re traveling beyond Southern California or spending time in cooler climates. It’s not just a heater. It’s independence from finding hookups and a dramatic quality-of-life upgrade. Here’s what you need to know.

How Espar Heaters Work

An Espar heater burns propane to create heat. It’s installed inside the van with an intake and exhaust ducted outside, so no fumes enter your living space. A thermostat controls when it fires, and a small amount of 12V power from your battery runs the system.

Unlike a simple propane space heater that sits in your living area, an Espar heater is dedicated infrastructure. It’s always available, takes zero living space, and runs efficiently.

Why We Install Espar in Our Builds

Efficiency: An Espar heater uses roughly 0.25-0.35 gallons of propane per day in cold weather. A 30-pound propane tank (about 7 gallons) heats for 2-3 weeks of regular use. That’s legitimately practical for off-grid living.

Safety: All exhaust goes outside. The heater has built-in safety features. It’s designed for enclosed vehicle spaces.

Temperature control: You set a thermostat. The heater maintains that temperature automatically. No cold nights waking up shivering.

Reliability: Espar is the industry standard. We’ve installed dozens. We know the system, the failure modes, and how to troubleshoot.

Integration: The heater ducts into the van, so you get real heat distribution, not just localized warmth.

Espar Models for Vans

The most common Espar model for vans is the Airtronic D2 (diesel) or the Hydronic D2 (hydronic, heating a coolant loop). For propane, we typically use Espar’s propane heater models.

Power options:

2 kW heater: Sufficient for a van in mild to moderate cold. This is entry-level.
4 kW heater: Full comfort heating in freezing conditions. This is the most practical for vans.
5 kW heater: Overkill for most vans unless you’re in extreme cold.

A 4 kW Espar heater keeps a well-insulated van at 70 degrees F while it’s 30 degrees F outside. That’s the target for most van builds.

Installation and Placement

Installation requires:

Ductwork routed through the van (or a single duct to the main living area)
An intake and exhaust penetration through the van wall or roof
Electrical wiring to the heater controller and thermostat
Propane line connected to the main tank

We typically route the intake from outside (so it pulls fresh air, not cabin air) and the exhaust out through the roof or a side wall. The placement is strategic to avoid blocking storage or living space.

Professional installation is recommended. DIY is possible if you have mechanical skills and experience, but it’s easy to make mistakes with exhaust routing or propane connections.

Cost Breakdown

Heater unit (4 kW Espar): $1,500-$2,000

Installation labor: $800-$1,500 (depends on complexity and your van layout)

Ductwork and materials: $200-$400

Total installed: roughly $2,500-$3,500

This is significant, but it’s worth it if heating matters to your van use. A Basic build might skip it. A Standard or Premium build should have one.

Propane Consumption

Real-world data from our builds:

Overnight heating in 40 degree F weather: 0.2-0.3 gallons per night
Full day in 30 degree F weather (heater running intermittently): 0.3-0.5 gallons
Full day in 10 degree F weather: 0.5-0.8 gallons

A 30-pound propane tank holds about 7 gallons. If heating is your only propane use, you get 10-20 days of comfortable heating in cold weather. Add propane stove use and water heating, and you’re refilling more frequently.

Most people combining heating, cooking, and water heating on propane refill every 2-3 weeks if they’re using all systems regularly.

Thermostat and Control

Espar heaters come with a simple thermostat or can be integrated with smart climate control systems. Most of our builds use the basic thermostat: set it to 65 degrees, and the heater fires as needed to maintain that temperature.

Some newer Espar models allow smartphone control, which is handy if you want to pre-warm the van before arriving.

Real-World Performance: SoCal Perspective

If you’re mostly using your van in coastal Southern California, an Espar might feel like overkill. Winter nights rarely go below 45-50 degrees F. A simple propane space heater or good insulation plus layering gets you through.

But if you’re heading to the mountains, the desert in winter, or driving north to Oregon, an Espar is the difference between comfort and misery. You’re camping in 30 degree F weather and waking up warm. You’re parked in your van and can actually sit comfortably instead of huddling in a sleeping bag.

For full-time vanlife beyond Southern California, it’s non-negotiable.

Maintenance

Espar heaters are simple systems. Annual maintenance includes:

Checking the propane connection for leaks
Inspecting the exhaust for blockages
Testing the thermostat
Cleaning filters if applicable

This takes 30 minutes and isn’t something you need to pay for. It’s basic owner responsibility.

Diesel vs Propane Espar Heaters

Some vans use diesel heaters (especially if the van itself is diesel). Diesel heaters are extremely efficient because they can use fuel from the van’s main tank. Propane heaters require a separate propane system.

For vans we build, propane Espar heaters are more practical because:

We’re already running propane for cooking
The propane system is separate and fail-independent
Installation is cleaner on non-diesel vans
Cost is lower than diesel heater options

If your van is diesel and you’re seriously considering a diesel heater, that’s a longer conversation, but we’ve had good results with propane Espar for our builds.

Is It Worth It?

If you’re building a van for occasional weekend trips in SoCal, you might not need an Espar. Good insulation and a sleeping bag are sufficient.

If you’re building for extended trips, winter use, or full-time living anywhere cooler than coastal Southern California, an Espar heater is one of the best investments you can make.

The cost is real. The benefit is better sleep, more comfortable days, and the ability to stay in places other people leave because they’re too cold.

Installation at Emery Custom Builds

If you’re having us build your van, we can install an Espar heater as part of the build process. We spec the right model for your situation, integrate it with your layout, test it thoroughly, and walk you through how to use it.

If you’re curious about whether an Espar makes sense for your van and climate patterns, let’s talk. We’ll discuss your actual use and help you decide what heating makes sense.

Espar Heater for Van Conversions