Monterrey Plush Waterbed Mattress Insert



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Monterrey Plush Waterbed Mattress Insert, the normal mattress built to drop into your waterbed.


  1. The mattress is made to fit a waterbed.
  2. Uses your existing wood frame water bed.
  3. Keep your under-bed storage drawer pedestal.
  4. Easy to make.
  5. Keep your matching bedroom furniture.
  6. Utilize your existing bedding.
  7. No more draining, filling or waterbed conditioner is needed.

It’s the ordinary, extraordinary, plain old mattress made to fit right inside your old waterbed frame. The Monterrey Plush Waterbed Mattress Insert is Therapedic’s solution to your old waterbed woes.


See other Therapedic products

Price Includes:


Monterrey Plush Waterbed Mattress Insert

Thinking About Doing Away with Your Waterbed Mattress?

Try This First!


The Monterrey Plush Waterbed Mattress Insert is an innovative design that is built around the idea of saving you money. How do you ask? By utilizing everything you already own. The only investment you need to make is the mattress itself. It is simply a mattress that fits waterbed frames. Keep your hardside frame, headboard, drawers, and even the matching furniture. Keep all your bedding such as waterbed sheets, mattresses pads, and comforter.


Eliminate your old water mattress and heater. Keep your safety lining. The flippable coil spring mattress is made by Therapedic and is slightly smaller than the frame in width and length. This leaves you plenty of space for your bedding and hands when you make the bed each morning. No more leaks, no more utility bills. No more garden hoses, long drain and fill times.


The Monterrey Plush Waterbed Mattress Insert is slightly undersized all the way around to fit better than an ordinary mattress and there is still room to get your hands along the sides to make it up. Ordinary mattresses found in furniture stores and mattress stores won’t fit like this. This cozy little mattress includes two sides so you can flip it over and last you longer.


Regular care that includes flipping the mattress over and spinning it end to end promotes better and more even mattress wear. We always say that it is like rotating the tires on your car and keeping them properly inflated, you don’t have to do these things but if you do, you will get many more years of life out of your investment. The incredibly soft surface will ease painful pressure points that cause us to move around and toss and turn.


The steel coils that support this surface from underneath give firm solid support and are the core support for this sleep system. Trust us when we say that you’ll dream about crawling into this bed every night. It is our Very Best Seller!


Did We Mention The Benefits


  • Two Sided
  • Flip it over
  • Spin it around – end to end
  • Double-sided
  • Turn it over


Featured Mattress Firmness: Monterrey Plush Waterbed Insert


Firmness Rating: 5.5 – 6

This waterbed mattress insert combines a supportive core with a luxuriously plush top layer, offering a perfect balance of firmness and cloud-like comfort. It’s designed to avoid the engulfing feel associated with overly soft mattresses, providing a supportive base while ensuring the plush top cradles you in comfort. The result is a sleep experience that’s both comforting and balanced, ideal for those who cherish a soft embrace without compromising on support.

Understanding Mattress Firmness:
A Quick Guide Of Our Firmness Rating Overview (1-10 Scale):


Firmness For Water Mattresses:

1: Ultra-Soft, our softest option. Imagine lying on a gently bobbing boat; this is our softest, cloud-like water mattress.
4: Firm, the firmest among water mattresses. This is where water meets firmness – still with that gentle water feel, but with maximum support.


Firmness For Coil Spring Mattresses:

5: Firm, marking the entry point into our coil spring range. It’s firmer than our firmest water mattress but maintains a gentle feel, providing a nice balance for those transitioning from water to coil spring mattresses.
10: Ultra Firm, the hardest mattress we offer. The epitome of firmness; think of lying on a firm, supportive surface that holds you perfectly without any sink.



Monterrey Plush Waterbed Mattress Insert Measurements / Sizes


Super Single Waterbed Frame

  • Cavity Measures 48 wide X 84 long.
  • Replacement Water bed Mattress Insert Measures 46 wide x 82 long.

California Queen Waterbed Frame:

  • Cavity Measures 60 wide X 84 long.
  • Replacement Water bed Mattress Insert Measures 58 wide x 82 long.


California King Waterbed Frame:

  • Cavity Measures 72 wide X 84 long.
  • Replacement Water bed Mattress Insert Measures 70 wide x 82 long.


Mattress Height:

  • From Bottom to Top Thickness–Approx. 13″
  • Measurement may vary slightly due to being handmade.
  • Tape Edge to Tape Edge–11.5″ This is the according to on side of the mattress.
  • Measurements are approximate and can vary slightly because they are handmade.

Warranty — 10 Year

Photo for illustration purposes. Fabric color may vary from the actual photo.

Additional information

Weight N/A
Dimensions N/A

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Product Features

Learn About The Monterrey Plush Waterbed Mattress Insert Product Features


  • Fabric–Stretch Knit with Surface Fresh™
  • Quilt— FR Safe Fiber
  • 1″ High-Performance Gel Foam
  • 1/2″ Comfort Foam


  • Pillow Top – n/a on this model. Please select our Monterrey Pillow Top Insert
  • Upholstery – 2-1/2″ Plush 5-Zone Plush Foam
  • Insulator Liner
  • Support System
    • 805 Alternating Coil LFK
    • 14.5 Gauge Steel Thickness
    • Coil count
    • Twin–462
    • Full–660
    • Queen–805
    • King–1015

Edge – Superior Foam Encasement


Boxspring / Foundation: 

Not Available. This mattress does not require a box spring/foundation, it simply installs flat on the decking of your hardside waterbed cavity.

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