California king heated mattress pads

The picks, with the numbers

Ranked on what the maker publishes, not on a score we invented. Tap a row for the full write-up, or go straight to the listing. Cost is 8 hours at the rated wattage and $0.1834/kWh.

Heated blanket picks compared by published wattage and computed cost per night

#	Product	Best for	Watts	Per night	Price
1	Top pickValthie Heated Mattress Pad, California KingTwelve heat settings, an 18-inch pocket stated to fit 8 to 21 inch mattresses, preheat, ETL and a 5-year warranty. The best-specified Cal King pad we found.	The deepest pocket and the most settings	Not published	Uncomputable	$109.99 - See it on Amazon
2	Beautyrest Cotton Blend Heated Mattress Pad, California KingThe one Cal King pad here certified to UL rather than ETL, with a 1-hour preheat, a 10-hour shut-off and a 5-year warranty on five heat settings.	The only UL mark at this size	Not published	Uncomputable	$104.99 - See it on Amazon
3	Serta Heated Mattress Pad, California KingTen heat settings and a shut-off you set in one-hour increments from 1 to 12, on the pad Serta also sells as a mattress protector. Still no warranty term.	The finest timer control	Not published	Uncomputable	$101.61 - See it on Amazon
4	Sealy Heated Mattress Pad, California KingTen settings, a 1-12 hour programmable shut-off, ETL and FCC, and a 17-inch pocket. Also the listing that calls itself energy-efficient without publishing a wattage.	A 17-inch pocket and a wire-free feel	Not published	Uncomputable	$129.99 - See it on Amazon
5	Bwarm Heated Mattress Pad, California KingNine heat settings per side, an 18-inch all-round pocket and a 5-year guarantee, from the least familiar name at this size.	A stated warranty at the low end	Not published	Uncomputable	$69.99 - See it on Amazon

Sources: wattage from each maker's own published listing, cited on the card below. Cost is our arithmetic at the EIA rate, shown in full on cost to run.

#ad how we are funded - price as of October 16, 2026

1

The deepest pocket and the most settings

Valthie Heated Mattress Pad, California King

Rated wattage

Not published

8 hours costs

Uncomputable

$109.99 - See it on Amazon

#ad how we are funded - price as of October 16, 2026

Twelve heat settings, an 18-inch pocket stated to fit 8 to 21 inch mattresses, preheat, ETL and a 5-year warranty. The best-specified Cal King pad we found.

Where the wattage comes fromNo wattage published. Valthie publishes dimensions, pocket depth, both cord lengths, heat settings, timer range, certification and a warranty term, and no rated draw.

Size

California king, 72" x 84", 18" pocket stated to fit 8-21" mattresses

Heat settings

12 levels

Auto shut-off

1-12 hours

Controllers

2 (dual zone at queen and larger; 1 at twin, twin XL and full)

Certification

ETL certified

Warranty

5 years, stated by the maker

Rated watts

Not published

Pocket depth

18", stated for 8-21" mattresses

Preheat

Yes

Controller

LCD that blanks after 20 seconds

Cords

6 ft power, 12.8 ft controller

Model

DR-06

What it does well

• +Twelve heat settings, the finest control at this size
• +18-inch pocket with a stated 8 to 21 inch mattress range, the widest fit here
• +Publishes both cord lengths, which most listings do not
• +LCD blanks after 20 seconds so it does not light the room
• +ETL certified with a 5-year warranty stated

Where it falls short

• -No rated wattage, so the running cost cannot be worked out
• -The low-EMF claim carries no measurement in any unit, at any distance
• -Preheat is named but no curve or duration is published

Who this is forA California king with a deep or pillow-top mattress, where the pocket has to stretch further than 15 inches.

Skip it ifSkip it if you want the running cost before you buy. Nothing at this size publishes a wattage, and this listing is no exception.

• Source: Valthie Heated Mattress Pad California King - 72 x 84 in, 18 in pocket, 12 settings, ETL, 5-year warranty — manufacturer listing, Amazon.com (retrieved 2026-09-26)

2

The only UL mark at this size

Beautyrest Cotton Blend Heated Mattress Pad, California King

Rated wattage

Not published

8 hours costs

Uncomputable

$104.99 - See it on Amazon

#ad how we are funded - price as of October 16, 2026

The one Cal King pad here certified to UL rather than ETL, with a 1-hour preheat, a 10-hour shut-off and a 5-year warranty on five heat settings.

Where the wattage comes fromNo wattage published. Beautyrest publishes dimensions, pocket depth, both cord lengths, the preheat duration, the shut-off ceiling, a UL mark and a warranty term, and no rated draw. That is true of all six Beautyrest products we track.

Size

California king, 72" W x 84" L plus a 15" skirt, stated to fit up to 18" mattresses

Heat settings

5 levels

Auto shut-off

10 hours

Controllers

2 (dual zone at queen and larger)

Certification

UL certified, stated on the listing

Warranty

5 years

Rated watts

Not published

Pocket depth

15" skirt, stated to fit up to 18"

Preheat

1 hour, stated

Cords

6 ft power, 12 ft controller

Model

BR55-0202

What it does well

• +UL certified, where every other pad at this size names ETL
• +The preheat is given a duration rather than a marketing word
• +5-year warranty, which Beautyrest states on all six products we track
• +Cotton-blend quilted top rather than plain polyester

Where it falls short

• -Five heat settings, the fewest at this size
• -A 15-inch skirt claimed to fit an 18-inch mattress, which is a stretch on a deep bed
• -The low-EMF claim has no measured figure behind it
• -No rated wattage

Who this is forSomeone who wants the certification and the warranty in writing and does not need twelve steps of heat.

Skip it ifSkip it if your mattress is genuinely 18 inches or deeper. Two pads at this size publish a deeper pocket than this one.

• Source: Beautyrest Cotton Blend Heated Mattress Pad California King - UL certified, 1-hour preheat, 10-hour shut-off — manufacturer listing, Amazon.com (retrieved 2026-09-26)

3

The finest timer control

Serta Heated Mattress Pad, California King

Rated wattage

Not published

8 hours costs

Uncomputable

$101.61 - See it on Amazon

#ad how we are funded - price as of October 16, 2026

Ten heat settings and a shut-off you set in one-hour increments from 1 to 12, on the pad Serta also sells as a mattress protector. Still no warranty term.

Where the wattage comes fromNo wattage published. Serta publishes dimensions, skirt depth, cord length, heat settings, the timer increment and an ETL mark, and no rated draw. No Serta product we track states one.

Size

California king, 72" W x 84" L plus a 15" skirt, stated to fit 18" mattresses

Heat settings

10 levels

Auto shut-off

1-12 hours, in 1-hour increments

Controllers

2 (dual zone at queen and larger)

Certification

ETL certified

Warranty

Not stated on the listing

Rated watts

Not published

Pocket depth

15" skirt, stated to fit 18"

Timer increment

1 hour, from 1 to 12

Cord

6 ft power cord

Model

ST55-0277

What it does well

• +Sets the shut-off in one-hour increments across a 1-12 hour range, the finest timer control we track
• +Sold as a mattress protector as well as a warmer
• +ETL certified and independently tested, per the listing
• +Machine washable with the controller removed

Where it falls short

• -No warranty term, which is true of both Serta mattress pads
• -A 15-inch skirt claimed to fit an 18-inch mattress
• -No rated wattage and no temperature range
• -Ten settings against twelve on the Valthie

Who this is forSomeone who wants the bed warm at a set hour and off at a set hour, without doing arithmetic on preset steps.

Skip it ifSkip it if a stated warranty is what makes you comfortable. Serta publishes five years on its queen blanket and nothing at all on its pads.

• Source: Serta Heated Mattress Pad California King - 72 x 84 in, ETL, 1-12 h in 1-hour increments — manufacturer listing, Amazon.com (retrieved 2026-09-26)

4

A 17-inch pocket and a wire-free feel

Sealy Heated Mattress Pad, California King

Rated wattage

Not published

8 hours costs

Uncomputable

$129.99 - See it on Amazon

#ad how we are funded - price as of October 16, 2026

Ten settings, a 1-12 hour programmable shut-off, ETL and FCC, and a 17-inch pocket. Also the listing that calls itself energy-efficient without publishing a wattage.

Where the wattage comes fromNo wattage published, and the listing still describes the pad as energy-efficient and as consuming less electricity than heating a room. Neither claim is checkable without a rated draw.

Size

California king, 72" x 84", 17" deep pockets

Heat settings

10 levels

Auto shut-off

1-12 hours, programmable

Controllers

2 (dual controller)

Certification

ETL and FCC, stated on the listing

Warranty

Not stated on the listing

Rated watts

Not published

Pocket depth

17"

Fabric

100% polyester, described as a wire-free feel

Washing

Machine wash at or below 30 C, no dry clean, bleach or iron

Model

SLM-HM72-OG

What it does well

• +17-inch pocket, deeper than the two 15-inch skirts here
• +ETL and FCC both named
• +Programmable 1-12 hour shut-off on ten settings
• +Publishes an actual wash temperature rather than just the word washable

Where it falls short

• -Calls itself energy-efficient while publishing no wattage to check it against
• -The listing also makes circulation and pain-relief claims, which we do not endorse and cannot verify
• -No warranty term stated
• -No temperature range, which Sealy does publish on two of its other products

Who this is forA deep Cal King mattress where 15 inches of skirt would not hold, from a brand already on the site.

Skip it ifSkip it if marketing claims bother you. This is the only pad here that advertises efficiency it publishes no number for.

• Source: Sealy Heated Mattress Pad Cal King Size - 17 in pockets, ETL and FCC, 1-12 h programmable — manufacturer listing, Amazon.com (retrieved 2026-09-26)

5

A stated warranty at the low end

Bwarm Heated Mattress Pad, California King

Rated wattage

Not published

8 hours costs

Uncomputable

$69.99 - See it on Amazon

#ad how we are funded - price as of October 16, 2026

Nine heat settings per side, an 18-inch all-round pocket and a 5-year guarantee, from the least familiar name at this size.

Where the wattage comes fromNo wattage published. Bwarm publishes dimensions, pocket depth, the timer steps and a 5-year guarantee, and no rated draw.

Size

California king, 72" W x 84" L, 18" deep

Heat settings

9 levels per controller

Auto shut-off

10 steps: 1-9 hours plus a 12-hour setting

Controllers

2 (dual control)

Certification

Not named on the listing

Warranty

5-year guarantee, stated by the maker

Rated watts

Not published

Pocket depth

18", 360-degree elastic

Fabric

100% polyester, knitted

Model

TT-84X72-1X-048

What it does well

• +18-inch all-round elastic pocket, matching the deepest here
• +Ten timer steps, 1 to 9 hours plus a 12-hour setting
• +5-year guarantee stated, which two better-known pads at this size do not give
• +Dual controllers as standard at this size

Where it falls short

• -No certification mark named anywhere on the listing
• -The ultra-low EMF claim carries no measurement
• -No rated wattage
• -The least familiar brand at this size, with no published model history

Who this is forSomeone comparing on the published specification alone rather than on the name on the label.

Skip it ifSkip it if you want a certification mark you can read. Four other pads at this size name ETL or UL and this one names neither.

• Source: Bwarm Electric Heated Mattress Pad Cal King Size - 72 x 84 in, 18 in pocket, 5-year guarantee — manufacturer listing, Amazon.com (retrieved 2026-09-26)

A king pad does not fit a California king, and the makers say so themselves

This is the whole reason the page exists. A California king is not a bigger king; it is a narrower, longer one. You do not have to take our word for the difference, because two of the brands here publish both sizes and the numbers are on their own listings.

On a blanket that margin would not matter much — a blanket drapes, and a few inches of overhang is a preference. A heated mattress pad is a fitted product with an elastic skirt that has to grip a specific rectangle. Six inches of excess width on a pad that is also four inches short does not settle into place; it rides, bunches and pulls off the corners, and a bunched pad concentrates the heating element. So the ordinary advice on king heated mattress pads does not transfer to this bed, which is why this is a separate page rather than a paragraph.

Pocket depth is the second measurement, and it is the one that varies

Every pad here publishes the same 72 by 84 footprint. What separates them is how far down the sides they reach.

Two of these listings are doing something worth naming. The Serta and the Beautyrest both state a 15-inch skirt and then claim the pad fits a mattress up to 18 inches thick. Those two numbers are in tension: a 15-inch skirt on an 18-inch mattress is relying on the elastic to make up three inches, which is exactly the situation that produces a pad creeping off a corner by February. It is not a false claim — elastic does stretch — but if your mattress is genuinely at the deep end, the 17-inch Sealy and the two 18-inch pads are making a smaller promise and are more likely to keep it.

Measure before you order, including any topper already on the bed, from the top surface to the underside. The same rule with the same reasoning is on how to choose a heated mattress pad.

Four ETL, one UL, one nothing at all

The Beautyrest is the only pad at this size that names UL. Serta and Valthie name ETL, Sealy names ETL and FCC, and the Bwarm listing names no mark at all.

To be clear about what that does and does not mean: ETL is not a lesser mark than UL. Both are US recognized testing laboratories and heated bedding sold here is tested to the same standard, UL 964, whichever lab does the testing. The meaningful line is not UL against ETL; it is named against not named, and four of these five are on the right side of it. What the marks actually certify is set out on what the certification marks mean.

Nobody publishes a wattage, and one listing calls itself energy efficient anyway

Across the 67 products in our registry, twelve publish a rated draw and all twelve are Bedsure, one Westinghouse blanket and one Sealy wearable. None of the five pads on this page is one of them, so there is no honest running cost for a heated Cal King bed and we will not estimate one. The whole ledger is on the watts, by model.

The Sealy listing goes a step further than silence. It describes the pad as energy-efficient and says it consumes less electricity than heating an entire room. The second half of that is almost certainly true — every heated blanket we have costed is a fraction of a space heater, which is worked out on electric blanket vs a space heater. The first half is a claim about this product that the same listing gives you no way to check, because there is no wattage anywhere on it. We are flagging it rather than repeating it.

Dual zones are standard at this size, and the cord lengths are not

All five ship two controllers. At 72 inches wide with two sleepers, that is the right default and nobody here departs from it, so it is not a discriminator. Serta and Valthie both state plainly that twin, twin XL and full get a single controller while queen and up get two, which is the same line every pad brand we track draws. The formats and the threshold are on dual control heated mattress pads.

What does differ, and what almost nobody checks before buying, is cord length. Valthie publishes a 6-foot power cord and a 12.8-foot controller cord; Beautyrest publishes 6 feet and 12 feet; Serta publishes a 6-foot power cord and stops there; Sealy and Bwarm publish neither. On a bed 84 inches long, the reach from the head of the mattress to the nearest outlet is a real measurement, and the answer to a cord that does not reach is not an extension cord — that is the one instruction every heated bedding manual we have read agrees on.

Where each pick is the wrong buy

• Valthie — the deepest pocket, the most settings and a stated warranty, and a low-EMF claim with no measurement behind it.
• Beautyrest — the only UL mark and a stated preheat duration, on five heat settings and a 15-inch skirt claiming an 18-inch mattress.
• Serta — the finest timer control we track, on a pad Serta states no warranty term for.
• Sealy — a 17-inch pocket and two named certifications, on the one listing here advertising efficiency it publishes no number for.
• Bwarm — an 18-inch pocket and five years in writing, and no certification mark named anywhere on the listing.

What about a California king electric blanket?

Different problem, and a much smaller one. A blanket is not fitted, so the width mismatch that rules out a king pad does not rule out a king blanket: the bed-size blankets we track state 90 by 100 inches, which covers a 72 by 84 mattress with room on every side. Cal-King-labeled blankets do exist and they change the drop rather than the fit. If you are shopping the blanket side rather than the pad side, start with king size electric blankets and read the stated dimensions rather than the size word on the box.

We have not slept on any of these pads, measured a surface temperature or timed a preheat. Everything above is quoted from what each maker publishes, which is the whole method and is set out on our methodology page.