The American National Standard for Portable Spas
Home And Garden Show Wisdom
Water Clarity with the Copper/Silver ionizer and the Calcium test .
Filtration Systems
What Makes a Good Spa.
How we service our customers out of state
Spa Shell Structure: The most important part.
Silly Stuff: Arthritus, Glue Joints and 100% filtering.
Compare spa ideas
Installing an energy efficient spa in the ground.
Instaling spas in and on decks.
What is involved in the installation of spas? Electrcal GFCI vs. Breakers
About Blower and Pump Clean-out and What is the best filtration system?
More on Full Foam Spa Use
"Spa Covers and Sunlight"
"Heater Problems: Basic Heater diagram
Misconceptions About Spas and How Spas Enhance Your Life
Bromine and Ozone
Air and Jet Therapy
Winterizing Your Spa
Nature2 and Other Ionizers
Filtering Spa Water
Hydrogen Peroxide
Standard Spa Care with Bromine
Insulation, Heat Retention and Freeze damage

 1997 through 2011
Havenmade Inc.
hot tubs and spas
James Arjuna
The Spa Specialist

Independent Test of Spa Energy Use

Spas And Hot Tubs

Haven Spas are made to a higher level of thermal efficiency than the winner
of this test.  I like to post information about spa design.
Another test from 1996 by the Universities of Colorado and Arizona:
Here is an excerpt from the report.  "a fully insulated spa {full foam} makes no attempt to recover and use waste heat."  (Tong and Rogers 1996). "...the performance of an insulating system which makes use of a thermal barrier, generated by waste heat rejected from the motors and pumps, in an enclosed air cavity around the tub is superior to a system which simply insulates the tub directly." Click and Read

copyright 2003, - 2008 Havenmade  Inc.
(Haven Spas are not sold in stores in Canada. We have shipped them to individuals there.
I would have loved to have a Haven Spa tested.)

In all of our testing of our new Holland made (yes made in the Netherlands), Haven Spas and our Holland Sister Spas, they are much better at saving energy that even the Haven spas of 5 years ago.  Remember, the Haven Spas of five years ago were averaging less than $20 per month in Colorodo.  We have documented a SCF in Longmont, CO on a year long test at $17 per month.   We are now running under 4.5 KWH per day at 10 deg C or 50 F.  (and making improvements on that daily) on electricity alone tested in our largest models, to manage the spa in "non use" times. This "non-use time" is the main criteria of all energy associations.  We have a spa using this design in Palmer Alaska, where it goes to -45 Degrees F in winter.  He bought it after his Crapdera spa froze really fast and was unreparable. I have no clue why people would purchase anything but a Haven Spa, considreing the quality and the exceptional service we offer to all our customers.  It is a huge puzzle to me.  I don't think people do the research and they certainly have not read this page or the main articles of this site.

However, when our spas are used (cover open and jets on high) they are the most energy efficient at using full power because they have the best plumbing and use less horsepower to product much stronger therapy as well as taking the heat from the motors and force that into the spa water at the moments of maximum heat loss. When the spa is losing the maximum heat out the top of the water surface, we are putting the maximum back into the water from the normally wasted heat of the pumps running on high.


Thermal Performance Test of Spas

Prepared by:
Advanced Materials
Alberta Research Council. Inc.
250 Karl Clark Road
Edmonton. Alberta T6N 1E4

Thermal Performance Test of Spas

This Report contains a summary of results from a test conducted by the Alberta Research Council (ARC).

The purpose of this report is to summarize the results of a test with eight spas for comparison of Steady State Power Demand. This measure is useful to the consumer because it is representative of the energy required to operate the spa.

The Alberta Research Council is a wholly owned subsidiary of the Alberta Science and Research Authority technology corporation dedicated to applied science. engineering and technology development.

The services of the Alberta Research Council were utilized to supervise and summarize the test results and every possible means was taken to ensure that the tests were conducted under similar conditions for all participating products.

Please consider the following notes when reviewing the contents of this report:

  1. All the spas were purchased at random from retail locations by the ARC and shipped to the
    testing facility.
  2. These tests were performed in a controlled environment and were not intended to represent an actual “field” application where wind. sunlight and product placement could influence the actual performances of the various products. It is felt however that such tests do reflect the relative performance of the tested products and that certain inferences can be safely drawn from the results.
  3. ARC does not specifically endorse any of the products tested.
  4. Many tests were performed by ARC on these products for research purposes and not all of them were for the expressed purpose of exploring the above hypothesis, but also to provide useful information for manufacturers that could be used to explore future design changes in the various products they manufacture. Only parts of the overall report are thus transferred to this compilation that pertain to specific tests and results namely the Steady State Power Demand testing.
  5. There are several differences in the spas that complicate the evaluation. Some of these differences are: variation in the spa volumes (from I.28 to 1.78 m3), different heating and filtering systems and their modes of operation; and small variations in the air temperatures during the tests.
  6. To ensure that there has been no misinterpretation of the data presented herein, ARC has reviewed this abridged report. A copy of their letter of review is provided on page 2.

Summary Report – Thermal Performance of Spas

This page is to confirm that Alberta Research Council Inc. (ARC) verifies the accuracy of the data contained within this Summary Report on steady state power demand of spas. ARC performed this non-standardized test on behalf of Arctic Spas, of Thorsby, Alberta.

A list of comparative spas for evaluation was provided by Arctic Spas and purchased by ARC for testing purposes. ARC researchers developed the test protocols used in the evaluation. Please refer to the following page for notes when reviewing the contents of this report. Performance of these tests does not imply an endorsement or recommendation of any product by ARC.

ARC develops and commercializes technologies to give clients a competitive advantage. A leader in innovation, ARC provides solutions globally to the energy, life sciences, agriculture, environment, forestry and manufacturing sectors.


In a typical application a spa is installed outside of the house where it is exposed to significant changes in ambient conditions. In the harsh North American climate, they may be exposed to prolonged periods of freezing temperatures. To prevent energy costs to keep the spa hot. good thermal insulation is required.

Eight spas were selected for testing and are listed m Table 1. The client made the selection of the spa vendors and models, but the independent third party that conducted the research purchased them. as any consumer would purchase them This includes spas produced by the client. so that no modifications could he made to the spas.

Spa # Spa Size Meters Water Volume Liters
1 Beachcomber, 740 2.26x2.28x1.05 1474
2 Sundance, Cameo 2.28x2.30x1.01 1434
3 Coast Spas, Lanai Silver 2.38x2.36x1.09 1719
4 Arctic Spas, Kodiak SS-1 2.36x2.36x1.04 1478
5 Hot Springs, Vanguard 2.54x2.31x0.97 1288
6 Arctic Spas, Coyote C-60 2.35x2.35x0.88 1287
7 XXX Spas, Atxxxic 2.38x2.35x1.02 1476
8 Arctic Spas, Kodiak SS-2 2.36x2.36x1.04 1579



For the purpose of spa testing, a measuring system was developed as shown in Figure 1.

The measured parameters were;

  • Ambient air temperature
  • Water temperature in the spa
  • Temperature of the spa shell
  • Temperature in the equipment enclosure
  • The power consumed by the pump; and
  • The power consumed by the heater

To perform the spas evaluation a set of parameters and conditions were established for the testing. The first series of tests were performed at room temperature (about 20ºC). The second series of tests were performed in a freezer chamber at a temperature of about minus 15ºC.

The temperature data was collected with Fluke HYDRA data logger with 21 channels. An example of data extracted at four simultaneously tested spas is given in Figure 2 on pg 4. A separate example of data loggers were used to collect data for power consumption evaluation. An example of data power consumption is shown in Figure 3 on pg 4.


 arctic2.jpg (73238 bytes)

arctic3.jpg (63971 bytes)

arctic4.jpg (47736 bytes)



The results of resting at steady state are shown in Table S-I and Table S-2 on pg 6, and figure S-9.

To determine the long-term energy consumption of the spas two sets of conditions were applied for each spa: room temperature and low temperature. Tests at room conditions were influenced by variations of the surrounding air temperature. The temperature variations are obvious over long testing periods. It should also be noted that some of the room temperature tests were performed m the freezer room. The freezer room has an insulated floor. where as tests performed outside the freezer room were on a concrete floor. The difference in flooring may influence the thermal system since the bottom of the spa represents a significant heat exchange area.

The long term, steady state condition power consumption is one of the critical spa parameters for the spa user. Comparison of the power consumption and specific energy demand is shown in Figure S-9.

arctic5.jpg (46165 bytes)

It may be concluded from Figure S-9 the energy consumption significantly increases when air temperature is decreasing. When decreasing temperature from 20ºC down to -13ºC on average the power demand increases 2.7 times indicating increased heat loss.

Assuming that the low temperature (-13ºC) tests are more indicative (significantly higher power demand) and considering the power consumption as a parameter for performance evaluation, the best performing spa would be (in order of best performing down):

Spa #8 Arctic Spas, Kodiak SS-2, Spa #4 Arctic Spas, Kodiak SS-1, Spa #5 Hot Springs, Vanguard, Spa #1 Beachcomber, 7-40, Spa #6 Arctic Spas, Coyote, Spa #2 Sundance, Cameo, Spa #3 Coast Spas, Lanai Silver, Spa #7 XXX Spas, Atxxxic.

Power consumption for steady state is influenced mainly by the overall spa thermal insulation. However, the size and usage frequency of the filtering systems and the way this system is installed also has impact on the spa performance. It is beneficial to the overall thermal efficiency of the system if some of the heat generated by the pump/motor can be retained in the system. In this case the heat will not be wasted energy but will contribute to the heating efficiency.


  • Power consumption evaluated at steady state conditions is a good parameter for spa performance evaluation. This measure is useful to the consumer because it tells the consumer how much energy is required to operate the spa.


Spa # Date Spa Water Volume Liters Ave. Air Temp ºC Water Temp ºC Test Time h ÅE kW Number of heating cycles Power demand W Spec. Power W/m³
1 Apr 24 Beachcomber, 740 1474 20 41 94.3 18.82 4 200 136
2 A29-M6 Sundance, Cameo 1434 20 40.5 142 37.15 24 260 181
3 Apr 24 Coast Spas, Lanai Silver 1719 20 42 94 33.20 8 352 205
4 Apr 24 Arctic Spas, Kodiak SS-1 1478 19.5 40 94 18.83 32 199 135
5 June Hot Springs, Vanguard 1288L* 21 40 60 8.14   135 105
6 June Arctic Spas, Coyote C-60 1287 21 41 84 16.18 7 193 150
7   XXX Spas, Atxxxic 1476     130 65.62 96 503 341
8   Arctic Spas, Kodiak SS-2 1579     128 19.06 12 149 94

* -No auto-filtering! Filter cycle must be started manually


Spa # Date Spa Water Volume Liters Ave. Air Temp ºC Water Temp ºC Test Time h DE Wh Heating Cycles Number Power demand W Spec. Power W/m³
1 Apr 24 Beachcomber, 740 1474 -11 41 60 29,055 14 484 328
2 A29-M6 Sundance, Cameo 1434 -11 41 72 21,145 20 671 468
3 Apr 24 Coast Spas, Lanai Silver 1719 -14 41.5 60 49,465 5 824 479
4 Apr 24 Arctic Spas, Kodiak SS-1 1478 -14 41 84 24,824 15 414 280
5 June Hot Springs, Vanguard 1288L* -12 41.5 108 44,214 65 409 318
6 June Arctic Spas, Coyote C-60 1287 -12
7   XXX Spas, Atxxxic 1476 -11 41 72 102,864 18 1429 968
8   Arctic Spas, Kodiak SS-2 1579 -11 40.5 120 50,518 30 420 266

* -No autofiltering

  • An indicator of thermal performance, the tests performed at low temperature are more suitable. The low temperature tests have a larger heat difference, which emphasizes the heat losses making it easier to differentiate the performance of the various spas.


For the final evaluation the Steady State Power consumption was selected to best indicate the energy efficiency of the spas.

Results in order from least to most power consumption were:

Spa #8 Arctic Spas, Kodiak SS-2
Spa #4 Arctic Spas, Kodiak SS-1
Spa #5 Hot Springs, Vanguard
Spa #1 Beachcomber, 740
Spa #6 Arctic Spas. Coyote C-60
Spa #2 Sundance, Cameo
Spa #3 Coast Spas, Lanai Silver
Spa #7 XXX Spas, Atxxxic

As concluded from Figure S-9 (pg 5).

For the overall thermal performance of the spas three criteria were used, these include:

•    Specific steady state power demand (SSSD), W/m3
•    Steady state power consumption (SSP), W
•    Cooling time (CT), h

Each spa was ranked according to the results for each of the criteria. Points were assigned according to the rank (from I to 8! and the points from each test summed to provide a final score. Less points means better performance (1st rank) and more points means lower performance (lower rank).

Arctic Spas, Kodiak SS-1
Arctic Spas, Kodiak SS-2
Beachcomber, 740
Hot Springs, Vanguard
Sundance, Cameo
Coast Spas, Lanai Silver
Arctic Spas, Coyote C-60
XXX Spas, Atxxxic
Note:  The XXX Spas company sued me and our company to get this off our site. They have a habit of suing people who tell the truth about them. Since the cost of lawsuits can be in the millions of dollars in lawyer fees, over time, there is no way for a small company like ours to fight back.  Our insurance company simply settled with them for $7000. The only thing that stopped me from counter suing was the fact that the federal courts do now allow pro-se or non lawyers to defend corporations.   I had enough evidence against them to put them out of business for really bad fraudulent sales practices in Denver.
They closed their Denver operations, three stores about 2 years ago.  Now their crap spas are at Costco.  Every spa company who has sold at Costco has either closed, filed bankruptcy, filed bankruptcy and closed, or have been bought out by another company for practically nothing, pennies on the dollar of their original cost and value.  I fully expect this company to go away forever. 

So to comply with the lawyer's settlement agreement I am not allowed to publish their name anywhere on our site.  I can't even sell parts for their brand of spas, because I can't publish that brand name, for good or bad. But I can tell anyone in private conversations what I think of them and why. This is the most "evil" of all spa companies that has ever existed.  It is the bottom of the pit of moral degradation of the spa industry. Every other company wants them gone because of how they have damaged the spa industry in the USA, and in particlar in southern California.  I guess there has to be one really rotten apple to make even the next best seem good.  This is Einstein's theory of relativitiy in action.  HA! HA!

Size Of Spa VS Energy Use
Jet Numbers in the Brochure
"Modern" Metal Frames
How To BUY Quality
Multiple Pumps
Diverter Valves
Bogus Information
How Spas Filter Economically
What's Involved in Filtering?
Message Board Awareness
The Importance of Engineering
Installing Spas Indoors
Before You Buy any Spa About Controls
Read this about spa controls!!
Before You Buy any Spa
Read this about spa design!!
See the Haven Spas
Check out our very informative Message Board Forum
Hot Tubs and Safety: The US The U.S. Consumer Product Safety Commission

Email us!       Read More down-load a copy of the DAIT brochure in PDF format.