Isotemp Spa 20L


5.3 gallon marine-grade water heater.

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 (120 VAC) electric element off your inverter when you’re not driving. Check out our blog post about this water heater.

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 Promaster van coolant lines along with detailed installation guide and exclusive installation video. Details on what’s included in kit below in the description.

SKU: 6P2023SPA0003 Category: Tags: , ,


Isotemp Water Heaters General Features:

  • 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
    • Every Isotemp tank features a safety mixing valve that regulates the temperature of the water coming out of the tank so that water heated to 160+ degrees will not scald boat owners or their guests
    • Temperature of the hot water coming out of the tank can be adjusted to the preference of the owner by turning the mixing valve on the water heater
    • This feature allows the thermostat to be set at a higher temperature, while keeping the user safe from scalding
    • It also extends the capacity of onboard hot water by using only a fraction of the water in the tank to produce the desired water temperature
  • Standard heating elements are 750 watts which won’t overload generators or trip dock breakers
  • 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
  • 750 Watt immersion heating element as standard on all Isotemp Water Heaters

Check out our blog post about this water heater here.

Isotemp SPA 20 Marine Water Heater Features:

  • Exterior casing / jacket made of high quality polypropylene
  • Inner tank made of AISI 316 stainless steel
  • Includes safety valve, mixing valve and plug
  • Robust design and manufactured to highest-quality marine standards for long service life
  • Immersion heating element specially designed to heat water at bottom of tank
  • Thermostat-controlled mixing valve standard on all Isotemp water heaters
  • Aluminum mounting brackets adjustable for deck or bulkhead installations
  • Extra-thick insulation for low temperature loss, high performance
  • Extra-long corrugated coils for high heat exchange efficiency
  • Five-year limited warranty on inner tank against corrosion and material stress

Vanlife Outfitters Isotemp Water Heater Installation Kit for Promaster 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, 20+ page, step-by-step guide and video 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.

Installation Kit Includes:

  • 2x – brass 5/8″ barb to 1/2″ female NPT FNPT fittings
  • 2x – 1″ x 3/4″. PVC reducer bushings
  • 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
  • 1x – brass 1/2″ BSP female to 1/2″ NPT male adapter fitting
  • 2x – 5/8″ brass barb ball valves
  • 16x – Gates 32925 PowerGrip heat shrink hose clamps
  • 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 with wafer heads
  • 10x – 11″ stainless steel zip ties

Additional information

Weight 380 oz
Dimensions 24 × 15 × 15 in

Water Heater Only, Water Heater – With Promaster Installation Kit