Best Under Tank Heaters for Reptiles
Updated How we research
An under tank heater delivers belly heat through the glass, which suits species that thermoregulate against warm ground rather than basking under a light. What varies between mats is considerable: adhesive quality, watt density, how evenly the heat spreads across the pad, and how well the film survives years of humidity. None of them regulate themselves, so every mat needs a thermostat with the probe on the warm floor. Substrate depth over a mat changes surface temperature more than most keepers expect. We weighed even heat spread, build quality of the cord and leads, adhesive that does not lift, and clear watt ratings matched to common tank footprints. Sizing matters more than brand, since a mat should cover roughly a third to a half of the floor so the cool end stays genuinely cool. Smaller mats suit hatchling tubs and snake racks, larger ones suit adult terrestrial setups, and any mat under deep substrate needs careful probe placement.
The short version
We compared 8 picks. Our scores range from 6.8 to 8.6 out of 10.
- Best overall:Zoo Med Repti Therm Under Tank Heater, 16W, 4 Pack. Highest overall score in this guide at 8.6/10.
- Also great value:iPower Reptile Heating Mat with Controller, 6x8 in. Value score of 9/10, overall 7.8/10.
- Solid build:Zoo Med Reptitherm Under Tank Heater, 1-5 Gal. Build and materials score of 8/10, overall 7.5/10.
- Feature-rich:BN-Link Reptile Heat Pad, 8x12 in, 16W. Features score of 7/10, overall 7.4/10.
Scores are our editorial assessment, not customer ratings. How we score
As an Amazon Associate we earn from qualifying purchases. This does not change our picks. Affiliate disclosure
Zoo Med Repti Therm Under Tank Heater, 16W, 4 Pack
A Pack of 4 Zoo Med Repti Therm under tank heaters at 16 Watts, 12 Inch x 8 Inch, for 30-40 gallon enclosures.
iPower Reptile Heating Mat with Controller, 6x8 in
An iPower 6 by 8-Inch 8 Watts reptile heating mat with a temperature controller for reptiles and amphibians.
- 1.Zoo Med Repti Therm Under Tank Heater, 16W, 4 Pack8.6/10See on AmazonCheck price
- 2.iPower Reptile Heating Mat with Controller, 6x8 in7.8/10See on AmazonCheck price
- 3.Zoo Med Reptitherm Under Tank Heater, 1-5 Gal7.5/10See on AmazonCheck price
- 4.BN-Link Reptile Heat Pad, 8x12 in, 16W7.4/10See on AmazonCheck price
- 5.Zoo Med Repti Therm Under Tank Heater, 24W7.3/10See on AmazonCheck price
- 6.Zoo Med Repti Therm Under Tank Heater 8W, 2 Pack7.2/10See on AmazonCheck price
- 7.iPower Reptile Heating Pad, 4x7 in, 2 Pack7.0/10See on AmazonCheck price
- 8.iPower Reptile Heat Pad, 6x8 in, 8W, 2 Pack6.8/10See on AmazonCheck price
| # | Product | Our score | Price | |
|---|---|---|---|---|
| 1 | Zoo Med Repti Therm Under Tank Heater, 16W, 4 Pack | 8.6/10 | See on Amazon | Check price |
| 2 | iPower Reptile Heating Mat with Controller, 6x8 in | 7.8/10 | See on Amazon | Check price |
| 3 | Zoo Med Reptitherm Under Tank Heater, 1-5 Gal | 7.5/10 | See on Amazon | Check price |
| 4 | BN-Link Reptile Heat Pad, 8x12 in, 16W | 7.4/10 | See on Amazon | Check price |
| 5 | Zoo Med Repti Therm Under Tank Heater, 24W | 7.3/10 | See on Amazon | Check price |
| 6 | Zoo Med Repti Therm Under Tank Heater 8W, 2 Pack | 7.2/10 | See on Amazon | Check price |
| 7 | iPower Reptile Heating Pad, 4x7 in, 2 Pack | 7.0/10 | See on Amazon | Check price |
| 8 | iPower Reptile Heat Pad, 6x8 in, 8W, 2 Pack | 6.8/10 | See on Amazon | Check price |
A Pack of 4 Zoo Med Repti Therm under tank heaters at 16 Watts, 12 Inch x 8 Inch, for 30-40 gallon enclosures.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 9/10
- + Pack of 4 suits breeders or keepers running several enclosures
- + 12 x 8 Inch pad warms a solid hide area on mid-size tanks
- + Bulk pack usually lowers the cost per heater
- - Each pad needs its own thermostat or a multi-channel controller
- - Four pads is more than a single-pet household will use
An iPower 6 by 8-Inch 8 Watts reptile heating mat with a temperature controller for reptiles and amphibians.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 6/10 · Value 9/10
- + Bundled temperature controller adds control out of the box
- + 8 Watts output is gentle for small tanks and amphibians
- + 6 by 8-Inch size fits a warm hide area on small enclosures
- - Dial style controllers are less precise than probe thermostats
- - Only suitable for small tanks or as a secondary heat source
Zoo Med's Reptitherm under tank heater for 1-5 gallon reptile terrariums, a small adhesive heat pad for tiny enclosures.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 8/10 · Value 8/10
- + Small pad size suits nano tanks, isopod bins and hatchling setups
- + Adhesive mount sticks under glass for a clean look
- + Zoo Med Reptitherm pads are a long-standing, familiar product
- - Adhesive pads are hard to remove or reposition once stuck
- - Always run it on a thermostat, as pads can reach unsafe temperatures
BN-LINK 8 by 12 inch, 16W waterproof reptile heat pad with an adhesive back, a low-cost under tank heater for mid-size glass tanks.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 9/10
- + 16 watt pad, 8 by 12 inches, 120 volt, with a peel-and-stick adhesive back for glass terrariums.
- + Listed as waterproof, flexible and water-resistant for easy cleaning, with a 15 month warranty.
- + Priced well below the Zoo Med pads in this guide, a good budget pick.
- - The listing text mentions both 30 to 40 gallon in the title and 10 to 20 gallon in the bullets, so check the size match on Amazon.
- - It has no built-in thermostat in the listing, so pair it with a separate controller.
Zoo Med Repti Therm under tank heater, 24 watts, 18 by 8 inches, sold for 50 to 60 gallon tanks, the same size and wattage as the original pick under a new listing.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 8/10 · Value 7/10
- + Same Zoo Med Repti Therm 24 watt size as the original, 18 inches long by 8 inches wide, so the guide keeps a full size option.
- + The title lists the 50 to 60 gallon tank range, which makes sizing simple.
- + From an established reptile heating brand, and the 24W rating suits a secondary heat source under a larger glass tank.
- - The listing returned no feature bullets, so mounting, cord length and thermostat compatibility are not stated here.
- - It is a large pad priced well above the small sizes, and it is a single heater that still needs a separate thermostat.
Zoo Med Repti Therm under tank heater, 8 watts at 8 x 6 inches, sold as a pack of 2 and listed for 10 to 20 gallon terrariums. A mid-size step up from the 4 watt pad.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 8/10 · Value 7/10
- + The listing says it sticks permanently to glass and works as a 24-hour heat source, with no lamp or bulb to replace.
- + It is listed as UL/cUL approved and usable with a thermostat, which is how any under tank heater should be run.
- + A pack of 2 covers two small tanks or a spare, and the 10 to 20 gallon rating fills the size gap in this guide.
- - It costs more than the 4 watt single pad it replaces because the price is for two heaters, so check you need both.
- - Heat from below only warms the floor, so it will not give an overhead basking spot or air warmth for the whole enclosure.
iPower 4 x 7 inch reptile heating pad in a 2 pack, listed at 4 watts for 1 to 5 gallon terrariums, with a 3M adhesive back and a 6 foot cord.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 9/10
- + The listing describes a 3M adhesive backing for good contact with the glass, and a waterproof and moisture proof design.
- + Two small pads in the pack let you warm two small setups, or use one as a spare, at a low price.
- + The 120V plug needs no adapter, and the spec sheet describes PTC heating material and insulation for efficient heat transfer.
- - At 4 watts and a 4 x 7 inch footprint it only suits very small enclosures, so larger tanks need bigger pads.
- - The product page has no built in thermostat, so you still need a separate controller to manage the surface warmth.
iPower 6 by 8 inch, 8W reptile heat pad sold as a 2 pack, the same brand and size as the original listing, with PTC heating material and 3M adhesive.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10
- + Same brand and 6 by 8 inch size as the original, 120 volts and 8 watts with a 6 foot cord and US plug.
- + PTC heating material and insulation are listed, with 3M adhesive paper to hold the mat in place.
- + Two mats in the pack, enough for two small tanks or a spare.
- - Sold as a 2 pack, so it costs more than a single pad if you only need one.
- - The listing has no thermostat and no tank size recommendation, so you must pair it with a controller.
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- Each pad needs its own thermostat or a multi-channel controller (Zoo Med Repti Therm Under Tank Heater, 16W, 4...)
- Dial style controllers are less precise than probe thermostats (iPower Reptile Heating Mat with Controller,...)
- Adhesive pads are hard to remove or reposition once stuck (Zoo Med Reptitherm Under Tank Heater, 1-5 Gal)
- The listing text mentions both 30 to 40 gallon in the title and 10 to 20 gallon in the bullets, so check the size match on Amazon. (BN-Link Reptile Heat Pad, 8x12 in, 16W)
- The listing returned no feature bullets, so mounting, cord length and thermostat compatibility are not stated here. (Zoo Med Repti Therm Under Tank Heater, 24W)
- It costs more than the 4 watt single pad it replaces because the price is for two heaters, so check you need both. (Zoo Med Repti Therm Under Tank Heater 8W, 2 Pack)
Frequently asked questions
›What is the best choice among under tank heaters for reptiles?
Zoo Med Repti Therm Under Tank Heater, 16W, 4 Pack is our top overall pick. A Pack of 4 Zoo Med Repti Therm under tank heaters at 16 Watts, 12 Inch x 8 Inch, for 30-40 gallon enclosures. It earns our score of 8.6/10, based on fit for the job, features, build and value.
›What is a good budget option?
iPower Reptile Heating Mat with Controller, 6x8 in is the strongest low-cost pick in this guide. An iPower 6 by 8-Inch 8 Watts reptile heating mat with a temperature controller for reptiles and amphibians.
›How much should I expect to spend?
Picks in this guide span See on Amazon price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Terrarium Nest independently selects every product; we may earn a commission from links above.
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