Step-by-Step HHO Installation on a Class A Motorhome

Motorhome HHO Advantages

Class A motorhomes offer installation advantages impossible in passenger cars: abundant engine bay space, high-output alternators (often 150–200A), and multiple convenient mounting surfaces. The large, flat firewalls of motorhomes make HHO cell mounting easy and secure.

Gas V10 (Ford 6.8L Triton) Setup

Required system: dual 9-plate cells in parallel targeting 2.0–2.5 LPM. Current draw: 25–35A total. EFIE: dual upstream O2 (one per bank). Mount cells on the driver-side firewall using a fabricated aluminum bracket. Run gas lines through a single bubbler to the intake air box. Expected improvement: 1.5–2 MPG on a baseline of 7–9 MPG.

Diesel Pusher (Cummins ISL 8.9L) Setup

Required system: dual 12-plate cells targeting 2.5–3.5 LPM. No EFIE needed. Mount in the rear engine compartment (pusher diesels have abundant rear space). Route gas line forward along the chassis to the air filter housing. Expected improvement: 1.5–2.5 MPG on a baseline of 8–11 MPG.

Safety for Living Spaces

The motorhome coach is a living space — HHO leaks that would be harmless in an open-air car are potentially dangerous in an enclosed motorhome. Install a hydrogen detector in the engine bay with an audible alarm. Ensure all gas line connections are inspected weekly. Never run the HHO system while the motorhome is parked in an enclosed area.