Systems Explained
One Aqua-Hot 125D delivers radiant cabin heat and on-demand hot water from the diesel tank you already have. The same heating brand you’ll find in $1M+ luxury motorcoaches, sized for a Sprinter.
The 30-Second Answer
The Aqua-Hot 125D does two jobs from one diesel tank: radiant cabin heat and on-demand hot water that doesn’t run out. Heat moves through fan coils tucked behind cabinetry, so the cabin warms up without a loud blower and without dry forced air. It runs off the diesel you already use to drive the van. Adds $11,000 to our Foundation climate package.
How It Works
It’s the same principle as the radiator system in a house, shrunk down to fit under your bench seat. A small diesel boiler heats a closed loop of glycol fluid. That hot fluid then carries warmth wherever you need it in the van.
System Diagram
Trace it from your van’s diesel tank, through the Aqua-Hot 125D, out to every fan coil and tap in the cabin. This is the exact layout we install in every Scout or Loft that gets the hydronic upgrade.
Why People Upgrade
The 125D runs multiple zones with their own temperature sensors. When a zone drops below your setpoint, glycol fluid circulates and brings it back up. You don’t get the hot-spot-by-the-heater, cold-spot-by-the-door problem that comes with a single forced-air outlet. The whole cabin feels like one room at one temperature.
Water heats on its way to the tap. There’s no holding tank to refill, so you can take a 20-minute shower, then do dishes, then run another shower. As long as fresh water is in your tank, hot water keeps coming. Recovery time is zero because there’s nothing to recover.
There’s no forced-air blower in the cabin. Hot fluid moves through fan coils tucked behind cabinetry, and the cabin warms up without a furnace cycling on and off all night. We’ve had customers tell us they couldn’t hear when the heat was running. That same gentle circulation keeps interior air pressure even, so warm air doesn’t push out through your door seals every time the heater fires.
The 125D’s burner vents exhaust outside the van. No combustion air comes into your living space and no fuel odor lingers in the cabin. And because nothing blows, dust on the floor stays on the floor. People with allergies or asthma have told us this is the difference between sleeping well in the van and not.
Honest Tradeoffs
Decision Framework
What It Costs at Sequoia + Salt
Hydronic adds $11,000 to our Foundation climate package, and that’s the all-in number. When you upgrade, the Foundation’s 1.5-gallon electric water heater is replaced by the 125D itself, not added on top of it. You’re not paying for two water heaters, and you’re not stacking line items on the invoice.
That $11,000 covers the Aqua-Hot 125D (the same heating brand used in $1M+ Class A motorcoaches), the full glycol loop and fan coils, the electronic controls and zone sensors, the plumbing tie-in to your hot water lines, and our installation labor. Everything is backed by our warranty.
Get real numbers for the Scout or the Loft in about two minutes. No salesperson, no email.
