Isotherm Isotemp 40 Liter SPA Water Heater Stainless Tank (11 USG)View all products in Hot Water Heaters #:  45633
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Isotherm Isotemp 40 Liter SPA Water Heater Stainless Tank (11 USG)

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Isotemp SPA 11US gallon (40l) stainless steel marine water heater with an inner tank made of AISI 316 stainless steel. A higher-quality water heater than the aluminum tank heaters commonly used on new boats.
More Details...   #45633
Brand:  Webasto Isotemp
MFG Part#:   6P4023SPA0003
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Indel Webasto Isotherm Isotemp SPA Water Heater 11 USG (40l)

SPA Water Heaters were designed to help boat builders and boat owners who want a higher quality water heater compared to the aluminum units commonly used on new boats.

The SPA features the highest marine quality standards while providing an optimized cost /quality ratio, with a polypropylene shell and a safety mixing valve.

The SPA line compliments the Isotemp Stainless Steel Water Heaters universally recognized as the best in the industry.

The thermostat-controlled mixing valve extends the volume of hot water and protects against accidental scalding.

  • 115 Volt AC, 750 Watt element for high performance, and low power draw.
  • Orientation: Horizontal or Vertical Mount
  • Heat Exchanger: Front
  • Exterior casing/jacket made of high-quality polypropylene insulation
  • Inner tank made of AISI 316 stainless steel
  • Includes safety relief valve, thermostatic mixing valve
  • Robust design and manufactured to highest-quality marine standards for long service life
  • Immersion heating element specially designed to heat water at the bottom of the tank
  • Aluminum mounting brackets adjustable for deck or bulkhead installations
  • Extra-thick insulation for low loss keeps water at a useable temperature for up to 24 Hours
  • Extra-long corrugated coils for high heat exchange efficiency
  • 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.
    • The mixing valve regulates the temperature of the water coming out of the tank to prevent scalding 
    • Extends the amount of usable hot water available
  • The 115V AC heating element is 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

  Isotherm SPA Water Heater Brochure

  Isotemp SPA Dimensional Drawings

  Isotherm SPA Water Heater Manual

Isotherm SPA Water Heater 11 USG (40 l)

  SPA 40
Part number 6P4023SPA0003
Volume (gal.) 11 (40 liters)
Dimensionsø D x L (inch) 15.6" x 25.65"
Weight (lbs) 30
Pressure release
valve (bar)
Heating Element 115 VAC
Nominal power (kW) 750 Watt Element

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Q. Do you offer Free Shipping?
A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

Q. What do you mean by most orders?
A. Some items are exempt from this offer and are indicated on the product page. Exempt items are usually bulky or heavy items such as buoys. Over 98% of the items on qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

Q. Where do you ship from?
A. We ship from Halifax, NS

Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

Q. Do you offer Express Shipping?
A. We offer Express Shipping on some orders depending on the items ordered and the delivery address. If Express shipping is available for your order you will see the option on the checkout page. If you do not see the Express option and you want Express shipping please send an email and we will provide you with a quote (

Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

This item has a shipping surcharge of CAD$30.00 for each unit.
This amount will be added to the shipping charges listed above.
Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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