Heating and Cooling› Heaters

AQUA HOT

HEATER, HYDRONIC-D 45.0 K-BTU 12 VD

$6,535.98

SKU: A0EC AHE-400-D02

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The Aqua-Hot 400D (Diesel) Hydronic Heating System is used in mid-size motorhomes and RVs to deliver consistent interior heat and continuous hot water. The 400D is a diesel-powered, on-demand system designed for reliable, quiet operation in all seasons. It is an all-in-one heating solution, providing both interior heat and continuous domestic hot water through a single, integrated system.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandAQUA HOT
Part NumberA0EC AHE-400-D02

Videos

Incredible Camper Heating System INSTALL / Aqua Hot Hydronic Heating + Rossmonster Vans

Incredible Camper Heating System INSTALL / Aqua Hot Hydronic Heating + Rossmonster Vans
A quick look at the Aqua-Hot 250D. What it does and how it works.

A quick look at the Aqua-Hot 250D. What it does and how it works.
This RV System Is the Best And Worst To Have At The Same Time - (Hydronic Heat)

This RV System Is the Best And Worst To Have At The Same Time - (Hydronic Heat)
Hydronic vs Air Heater | Which is the Best Van Heating Option

Hydronic vs Air Heater | Which is the Best Van Heating Option
Tiffin Motorhomes: A Closer Look - AquaHot System

Tiffin Motorhomes: A Closer Look - AquaHot System
Aqua-Hot Gen1 Installation Video with Sarah Yak

Aqua-Hot Gen1 Installation Video with Sarah Yak
One Simple Trick to Fix AquaHot/HydroHot Boiler

One Simple Trick to Fix AquaHot/HydroHot Boiler
Introducing Aqua Hot heat & hot water for your van. Plus bonus footage best of Humble Road.

Introducing Aqua Hot heat & hot water for your van. Plus bonus footage best of Humble Road.
Wanderlust's new hydronic heating system in action!

Wanderlust's new hydronic heating system in action!
How To Use an Aqua-Hot System

How To Use an Aqua-Hot System
Aquahot Boiler Fluid Change the Right Way! | RV Living | RV Life

Aquahot Boiler Fluid Change the Right Way! | RV Living | RV Life
How to add coolant to Aqua Hot Systems.

How to add coolant to Aqua Hot Systems.

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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