Isotemp Slim 20L (5.3 gallon)

$856.00

5.3 gallon marine-grade water heater.

The Slim models are characterized by a smaller diameter (12 inches) and longer length compared to the Spa models.

This water heater is a fantastic way to get hot water by simply running or driving your van. It can heat the water through the van’s coolant lines or using the 750 watt (120 VAC) electric element off your inverter when you’re not driving. Check out our blog post about Isotemp water heaters.

We sell the stand-alone water heater as well as the water heater with an installation kit that includes all the parts you need to connect this up to your Ram Promaster, Mercedes Sprinter or Ford Transit van coolant lines along with detailed installation guide (The installation guide features photos of a Ram Promaster installation, but the process of installing into a Sprinter/Transit van is very similar). Details on what’s included in kit below in the description.

$55 flat rate shipping to the lower 48 states.

8 in stock (can be backordered)

Choose if you want the water heater only or with an installation kit. See description below for details on the installation kits.

You can choose between standard stainless steel hose clamps or Gates PowerGrip heat shrink hose clamps in your kit. We prefer the PowerGrip hose clamps but other installers prefer standard hose clamps. The PowerGrip hose clamps are a bit more expensive which is reflected in the cost of the kits that use that option. The PowerGrip clamps require a heat gun and a bit of a learning curve to install. The standard hose clamps only need basic tools and are easier to remove for any maintenance.

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Description

Features:

  • Isotemp Slim features a brushed stainless steel cover
  • Inner tank made of AISI 316 stainless steel
  • All Isotemp water heaters use two thermostats: a temperature thermostat and a safety thermostat designed to trip in the event the tank is run dry
  • All Isotemp water heaters come standard with a mixing valve that regulates the temperature of the water coming out of the tank so that water heated to 160+ degrees can be thermostatically adjusted to your prefered temperature and extends the capacity of onboard hot water by using only a fraction of the water in the tank to produce the desired water temperature.
  • 750 Watt immersion heating element specially designed to heat water at bottom of tank
  • Robust design and manufactured to highest-quality marine standards for long service life
  • All Isotemp products are CE certified and manufactured in ISO certified facilities
  • All Isotemp tanks are covered by a 5-year limited warranty against leakage due to manufacturing defect or corrosion and a 2-year warranty on all other parts
  • Extra-thick insulation for low temperature loss, high performance
  • Extra-long corrugated coils for high heat exchange efficiency

Check out our blog post about Isotemp water heaters here.

Dimensions (PDF)
Manual (PDF)

Vanlife Outfitters Isotemp Water Heater Installation Kit for Promaster, Sprinter & Transit Vans

We've taken the mystery and hassle out of installing an Isotemp water heater in your van! If you add on our optional installation kit, you'll get all the fittings, hose and hardware necessary to install the water heater in a typical installation. No need to order all these parts separately and hope that you have the right parts. The kit also comes with very detailed step-by-step guide on how to install the water heater and connect it to your van's coolant lines . The only additional thing you'll need to purchase yourself is the Mopar coolant to top up the system after you install the water heater. Note, our guide does NOT cover plumbing your water lines - only the installation of the water heater itself but we do provide some advice for hooking up your fresh/cold and hot water plumbing.

The installation kit was originally designed for a Ram Promaster, but we have since confirmed that this is also compatible on a Mercedes Sprinter and Ford Transit. Our installation guide shows photos of the kit being installed on a Ram Promaster, however the installation is virtually the same on both Sprinter and Promaster - the key difference in the procedure for Transit or Sprinter vans is the process of cutting into the van's coolant lines near the "heater core" and we try to update instruction guide often to show these differences. The components of the kit vary slightly depending on your van type.

We offer three versions of the kit. The "standard" kit with 50' of coolant hose will work for installations where the water heater is located on the driver side of the van. If you're locating your unit on the passenger side or high off the ground, consider getting the "long" or "extra long" versions of the kit which add some extra hose and related fittings. Full details of what is included in each version of the kit below.

Your Choice of Hose Clamps
You can choose between standard stainless steel hose clamps or Gates PowerGrip heat shrink hose clamps in your kit. We prefer the PowerGrip hose clamps but other installers prefer standard hose clamps. The PowerGrip hose clamps are a bit more expensive which is reflected in the cost of the kits that use that option. The PowerGrip clamps require a heat gun and a bit of a learning curve to install. The standard hose clamps only need basic tools and are easier to remove for any maintenance.

Standard Kit Includes:

  • 2x - brass 5/8″ barb to 1/2″ female NPT FNPT fittings
  • 2x - 1-1/4" x 3/4". PVC reducer bushings (these are used to protect the coolant hoses as they pass from below the van into the van and can accommodate flooring systems up to 1" in height)
  • 50 feet - Gates 28411 straight heater hose - 5/8"
  • 2x - brass barb reducing tees – 3/4″ x 3/4″ x 5/8″
  • 2x - brass barb 5/8" 90 degree elbows
  • 2x - 5/8″ brass barb ball valves
  • 16x - stainless steel hose clamps OR Gates 32925 PowerGrip heat shrink hose clamps (requires a heat gun to install)
  • 1x - Loctite 592 thread sealant (6 milliliters/.2 ounce)
  • 1x - Permatex high-temp red RTV silicone (3 ounces)
  • 20x - 7/8" stainless steel insulated hose clamps
  • 20x - 3/4" #8 stainless steel self-tapping screws
  • 1x - 6' length of foam pipe insulation
  • 10x - 11" stainless steel zip ties

Long Kit Adds:

  • Additional 10 feet of Gates 28411 straight heater hose – 5/8″
  • Additional 2x brass barb 5/8″ 90 degree elbows
  • Additional 2x stainless steel hose clamps OR Gates 32925 PowerGrip heat shrink hose clamps

Extra Long Kit Adds:

  • Additional 15 feet of Gates 28411 straight heater hose – 5/8″
  • Additional 2x brass barb 5/8″ 90 degree elbows
  • Additional 2x stainless steel hose clamps OR Gates 32925 PowerGrip heat shrink hose clamps

Ford Transit Version Adds:

  • 1 foot of 3/4" Gates 28412 heater hose
  • Additional 2x brass barb 5/8″ 90 degree elbows
  • Additional 4x stainless steel hose clamps OR Gates 32925 PowerGrip heat shrink hose clamps

Additional information

Weight 592 oz
Dimensions 30 × 16 × 17 in
Options

Water Heater Only, Water Heater – With Promaster Installation Kit