DH9 Hydronic Diesel Hot Water System with D5E HS3 Eberspacher Furnace – ASSEMBLED SIDE BY SIDE


The unique DH9 Hydronic diesel hot water system provides fast hot water and optional air heating in a super compact form.  Say goodbye to the hassles, risk (in boats) and cost of LPG and enjoy the benefits of hot water and air heating from one compact setup when free camping, sailing or off the grid. Powered by the latest D5E HS3 hydronic furnace by Eberspacher, this is the smallest, quietest and most versatile diesel hot water system.


In Stock

SKU: DH9-D5E-SBS-RV Category:


The DH9 is Dieselheat’s smallest and most versatile diesel hot water system, with super fast heat up time, the DH9 will provide a sink full of hot water or a continuous shower at 2.5L/min within 6-7 min of a cold start whilst occupying a space the size of a couple of shoe boxes.

The beautifully engineered D5E HS3 furnace from Eberspacher modulates it’s heat output from 1.3 to 5kW, so the DH9 can work with a small coolant volume whilst avoiding excessive cycling, this also minimizes noise and power consumption.

The DH9 is sold assembled with the tank and furnace back to back on an aluminum mounting stand for easy installation and suits small spaces.

The DH9 has the following features

  • Our most compact hydronic system
  • Fully assembled and tested for quick easy install
  • All 316 stainless steel, suitable for caravans and boats
  • Fast heat up time, around 7min from cold
  • Integrated air heating (optional)
  • Includes Watermark approved tempering valve and plate heat exchanger to ensure hot water is always delivered at safe temperatures

Pair the DH9 with a Bricor Ultra Max low flow shower head to have super water wise showers – 0nly 2.5L/min, great for a caravan or boat where water is limited.

By adding in a Kalori fan head, the DH9 diesel hot water becomes an effective air heater, giving off up to 4kW of air heating from the single quiet Kalori Silencio 2 fan head.

The advantages of the brand new Eberspacher D5E HS3 Furnace include:

  • much quieter in terms of the combustion fan and overall noise
  • uses the new Eberspacher super quiet fuel pump (no ticking sound)
  • drops to low power much faster, so re-starts are much gentler and quieter
  • longer service life – 3000 hours is claimed
  • stepless power output from 1.3 to 5kW
  • when using fan heads for air heating, as long as the fan head is dissipating over 1.3kW it won’t cycle at all, and at low power it is as quiet as an air heater
  • soft start water pump that primes more easily
  • improved water and dust resistance
  • excellent installation kit

Kits now include the high temperature silicon floor plate to get the exhaust through the floor with a dust/water proof seal.

System Performance

Time to useable hot water from cold start: 6-7min

Time to fully hot: 9-10min

Regeneration time between showers: 4min

Length of shower assuming 30 degree temp rise using Dieselheat shower heads:

Bricor UltraMax 2.5L/min @ 40PSI: >15min (recommended shower head)

Bricor Elite 4L/min @ 40PSI:   4.5min (pushing the limits, better to use a DH15 for this shower head)

Length of time the system can achieve a 30 deg temperature rise:

2L/min – >15min

3L/min – 9min

4L/min – 3.5min

5L/min – 2 min

These numbers are all affected by ambient temperature, installation layout and assume no concurrent air heating, so should be taken as a guide.

See here for more information on the DH Hydronic Series

The pre-assembled and tested hot water system  includes:

  • compact 9L hot coolant tank
  • mounting bracket
  • Eberspacher diesel hot water furnace
  • combustion air silencer
  • exhaust system
  • silicon floor plate for exhaust
  • tempering valve
  • wiring loom with on/off switch
  • fuel pump and fuel line
  • on/off toggle switch

Note: the system is not shipped with coolant. The purchaser is required to fill the tank using a standard automotive corrosion resisting coolant mix.

Useful Dimensions

Minimum install space allowing for plumbing connections

600mm L x 160mm W x 280mm H (note access from above is needed to fill the header tank)

DH9 Installation Instructions

DH Hydronic Series Operator Manual 

Eberspacher D5E HS3 Technical Manual

Unlocking guide for Eberspacher Heaters using the Easy Start Pro Controller

You may also like…


Warranty Icon

Two Year Warranty

All our products are backed by a two year warranty.

Phone Icon

We're here to help

0418 130 971

Shipping Icon

Express Delivery

Freight calculated on check out.