VIVOSUN 48" x 20.75" Seedling Heat Mat and Digital Thermostat Combo Set, UL & MET-Certified Warm Hydroponic Heating Pad for Germination, Indoor Gardening, Greenhouse

This seedling heat mat with thermostat has been a staple in my indoor gardening setup for the past three seed-starting seasons, and it’s performed flawlessly. It delivers steady, controlled warmth that helps boost germination rates and keeps seedlings happy—no issues, no hassle.Pros:✅ Consistent Heating – Ideal temp range for seed starting✅ Thermostat Works Great – Simple to set and monitor✅ Durable – Still going strong after multiple seasons✅ UL & MET Certified – Safe for indoor and greenhouse useCons:❌ None so far!Final Thoughts:If you're serious about germination success, this combo set is absolutely worth it. Plug it in, set your temp, and let it do its job—it’s reliable season after season.

I bought this to add a little extra heat in my brooder box for my baby quail. I put a pillowcase over it and the quail like to sleep on top of it. I have to keep the temp 99 degrees in the box with a heating box, so I set the stat to 102 and if it reaches that temp the heat shuts off. This was a wonderful addition to for the chicks. It's a durable product and it looks good in the box. Very easy to set up and the thickness is perfect for them to crawl on. I can't smell anything coming from the pad when it's on so that makes me feel safe plus when I am done with it there is a storage bag, I can put it in

I used this mat to germinate my auto flowers I put a few in the humidity dome and the others in the paper towel with the plastic bag method .Placed everything on the mat inserted the probeSet the temp to 85 degrees & 3 days later every seed had popped 🙏🏾🥳Easy set upEasy installationValue for money you can use this for a long timeThe size is perfect once your done take it off the surface roll it up put it back in the box for the next use.Its durability is smooth I spilled water on it purposely and nothing happened.

The first unit received came with a defective thermostat. A replacement unit, which is functioning correctly, was shipped immediately after I notified Amazon of the problem. One star deducted for the inconvenience of receiving a defective unit initially, but I am happy with the quality and performance of the replacement unit, so I have ordered an additional two Vivosun heat mats to use with the system.

I am using to manage Sour Dough Starter and Dough Proofing temperature management. The thermostat on this unit is excellent - and since the temperature sensor has a long cable, it can be placed inside the dough/starter to the bottom of the container to prevent overheating. The way it works is the thermostat controller and the heating pad are two separate devices - the pad has a standard 120 Volt plug - it plugs into thermostat controller and teh controller plugs into your wall outlet. It DOES NOT VARY the temperature of the pad - it is either full on or full off - the thermostat probe determines if Pad gets turned on or off. So, you need to place the probe in the correct place to ensure whatever you are heating doesn't get too hot or not hot enough - for Sour Dough put probe at bottom of the vessel or close to the bottom (I use glass jars/bowls) and cover with a cloth towel so it heats as evenly as possible. I also use inexpensive "Aquarium" digital thermometers with long probe cords to check my starter/dough at different depths because depending on ambient room temp and how much it fluctuates during a 24 hour period, you may have to adjust the heating pad thermostat to compensate and you may want to put a folded cotton towel under the jar/vessel so that the heat from the pad is more gradual especially in rooms that go down to low-mid 60's at night while you are trying to maintain 72-75 or higher temperature throughout the starter/dough container - u don't want the bottom to be 80 and the top 72. I learned not to put thermostat too high - if I want 75 degrees and kitchen is 65 I set temp to 70-72 cover with towel and watch the small external aquarium thermometer set in the middle of the dough and the thermostat probe that controls pad at the bottom - leave it for a few hours and check both readings - adjust as needed and use folded towel under jar if you need to raise heater pad temp just to be safe. But.. the heating pad unit probe temp reading matches my very accurate digital professional probe thermometer to 1/10th of a degree so I don't have to worry about "false/inaccurate" control of the heating pad- not bad at all. The Pad itself heats quickly but doesn't get overly hot - you can place your hand on the pad safely under full power - you don't want a pad that gets too hot. I find it raises ambient room temperature about 5-10 degrees without much of a struggle - the larger the temp difference between set temp and item/room temp the longer it will take to get there - low and slow - took about 5-7 hours to raise 1000 grams of covered dough in a glass bowl from 68 to 75 degrees with thermostat about 80% deep in dough towards bottom and temp set for 77 (bottom of dough was 77, top was 75, room temp varied from 64-72 in 24 hour period). The pad stays warmer, longer, closer to the electrical line cord end and cooler on the end furthest from the cord - as thermostat turns pad on and off during a warming cycle, the end closest to the cord warms first and then spreads to all corners but it does take time for that to happen 20-30 minutes for even heating all around.

Used this for my beer fermentation and it managed to keep the fermenter at 22C in a 68F basement storage room. Very happy this is helping me ferment my beer.

I have this in my greenhouse and seeds started growing in a few days.