5 Best CO2 Regulators For Grow Room 2021

Growing plants need some basic elements to survive. One such all-important element needed is carbon dioxide (CO2). It is even more important in a controlled environment such as a grow room. CO2 is needed because they ensure a high yield of crops; therefore it is necessary to invest in the Best CO2 Regulator for Grow Room.

CO2 regulators ensure your plants get an adequate amount of carbon dioxide which helps to support photosynthesis especially because there is lack of sunlight in grow rooms.

In this article, we will review some of the top options on the market. We will also give you a guide on the factors to consider before making a buying decision and the reason why a CO2 regulator is needed. That’s not all, we will also bring you information on how to set up a CO2 regulator. We have a lot to learn, so let’s get started already.

Why You Should Trust Us On This Guide?

Having been in the business of researching and reviewing products, we can assure you that we have the experience needed to deliver. We don't just pick any product that catches our fancy but ensure that proper research is carried out by our team of experts, tests are done and studiers are made before vouching for any product.

Hence, you can expect that we will give you bring to you only the best products on the market and not just that but will also give an unbiased review of the products. A read through this article will convince you we did a good job while purchase and use will further validate our claim.

Why Use CO2 in Your Grow Room?

Currently, the atmosphere is made up of 400 PPM (parts per million) of CO2 regardless of the prevailing global warming. However, some plants (such as cannabis) can utilize as much as 1500PPM of CO2 that used to be in existence before now. Hence, the more CO2 is available, the larger the plants are and the more yield it results to.

This is where CO2 regulators are needed as they play an essential role in the success of your grow room. These regulators are made specifically to release a high amount of CO2. This is done by the release of carbon dioxide gas from the generator tank into the grow room to be used up by the plants.

Regulators are usually used for large scale growing operations or in places that deal with the professional growth of cannabis.

How to Pick the Best CO2 Regulators For Grow Room?

While there are many regulators on the market with the claim of being the best, you may end up purchasing one that’s not good enough to meet your needs. Hence, it’s important to consider some factors before purchasing a CO2 regulator; this will facilitate a good choice. The factors include:


It is important to consider what the regulator is made up of. Most regulators are made of brass (especially the products reviewed in this article), they are ideal hence you should consider one of high quality that will not be damaged by external factors. A very good casing ensures the components of the regulator are shielded against moisture and dust.

Ease of Use

This is another important factor that must be considered if you hope to enjoy the product. Since CO2 is just one part of the system, it’s ideal that it is user-friendly. There is a need for comprehensive instructions on the use of the equipment to enable users quickly get a hang of it. Purchase a regulator with self-calibration features as this will ensure you don't have to adjust it yourself thereby giving you ease of use.

Size of Grow Room

Before buying a CO2 regulator, it is necessary to get the measurement of the grow room to avoid buying one that is too big or too small. CO2 regulators have a limited size of growing room space they can cover to ensure optimal performance. Hence depending on the size of your grow room, you may need to install more than one CO2 regulator.


The sensor is one of the key features of a regulator. Sensors ensure the unit will turn on its own when its time (usually during the day). While at night it is expected to automatically turn off without having to press anything. If this is not the case, then you have wasted CO2 as well as energy.


The display of the CO2 regulator should be easy to view regardless of the time of the day. Whether its day or night, you should be able to see if the level of CO2 concentration is right and if it’s not, then more needs to be released and vice versa.


All CO2 should come with some form of warranty even if it’s just for a year. The longer the warranty, the better the product. A warranty ensures that the product is shielded against defects and that there’s a replacement from the manufacturer once an issue arises so long as it’s not due to your negligence.

High-Pressure Gauge

Most CO2 tanks have 800psi, but the CO2 regulator to be bought should have at least 1000psi. it should also have a low-pressure gauge with reading between 15 to 30 psi and should not exceed 200psi. When it's reading 30psi, it means that the regulator output is a maximum of 15 psi and anything lower than that means it’s less than 10psi, a number that is generally not suitable for CO2 release. If a low-pressure gauge reads more than 200 psi it then means that adjusting the pressure to a suitable range (between 10 to 30 psi) will be difficult.

Read more: How to Pick the Best Dehumidifier for Grow Room?

5 Best CO2 Regulator Reviews on the Market

After careful research, we bring you the top five products on the market. They include:

1. CO2 Meter Day and Night CO2 Monitor and Controller for Greenhouses

If ever there is insufficient CO2 in your grow room, hydroponic room, greenhouse or any other place, then CO2 Meter Day and Night CO2 Monitor and Controller for Greenhouses are here to the rescue. In cases where the CO2 level drops, power gets supplied to a regular or a CO2 generator using an in-built 100-240 VAC 5A piggybank power chord.

It features a CO2 generator control that helps you regulate the CO2 concentration in an environment. It has an NDIR CO2 sensing technology too. It also helps you establish Non-UV emitting LEDs, the photosensor that turns off the CO2 emission at night and also the IP54 enclosure. It also comes with a sizeable LCD digital display; this indicates the reading of the CO2 concentration and the temperature. This feature can be activated with three push button thereby making it an ideal CO2 controller and monitor. It is made of high-quality materials, it’s also easy to use and ideal for everyday use.

Furthermore, it has a lower limit, upper limit, power as well as photosensor verification LEDs. Its lower set point is at 800PPM while the high limit is at 1500PPM with an over-all range of measurement that’s between 0 to 10,000. Hence, all that needs to be done is to mount it in your plant, link it to an electrical socket and then connect to your regulator. It functions at an operating temperature of 32 to 122oF, with an accuracy of +/-70PPM or +/15% CO2.


  • It is easy to install and use
  • It has a quick response sensor
  • The sensor can last up to 15 years
  • It does not affect the plant’s grow cycle


  • There are limits to its calibration
  • Warranty on the product is only limited to one year

2. Titans Controls Day/Night Carbon Dioxide (CO2) Monitor & Control

This is a hassle-free CO2 regulator with a good reputation of being one of the most straightforward CO2 controllers on the market. It’s no wonder it’s in high demand, its simplistic functioning capacity is quite commendable. This product only requires one setting and that's to set up the CO2 level to your desired preference, the rest is taken care of by the brand.

It features a photocell that registers whether its night or day, this helps maintain an ideal level of CO2 concentration at all times. Titans Controls Day/Night Carbon Dioxide (CO2) Monitor & Control has 1500PPM of CO2 control while functioning at 15Amps/120volts/60Hz, its setting ranges from 1000 to 2500PPM.

This product is ETL listed for commercial use while its factory is also calibrated. These features make it a good choice for growing operations of various sizes; it also works well with other Titan Control products. This is one of the CO2 controllers that are easy to use.


  • It features a three-year warranty
  • It has active sensors
  • It has an in-built calibration feature
  • Its in-built photocell dispersed CO2 during the day


  • It is not cheap

3. VIVOSUN Hydroponics CO2 Regulator

Next on our list is the VIVOSUN Hydroponics CO2 Regulator. This is well known for its hydroponic machinery, it offers one of the cheapest regulators for your growing plants. Although it’s cost-effective, yet it offers quality value. It has great features that deliver on its promises. This regulator is ideal for greenhouses, indoor grow rooms; grow tents and other premises which accelerates physiological growth. Its various amazing features result in an increased yield of up to 30%.

The product is also basically made with brass along with an industrial solenoid valve, a standard power cord, 10-inch air hose (plastic), three-prong plugs, a precision regulator, 100 voltage flows, a flow meter that ranges from 0.5 to 15 CFH and then an inlet connection of CGA-320. There's a 1.58-inch high-pressure flow gauge working within the range of 0 to 4000PSI. The regulator is required to be used in combination with a CO2 controller to ensure optimal performance.


  • It features a four-year warranty
  • Ideal for those on a budget
  • It can fit into a standard CO2 tank
  • It is a high precision product


  • There have been reports of leakages
  • The hose does not feature a clamp

4. Taprite T752HP Two Product Dual Pressure Kegerator CO2 Regulator

Taprite T752HP Two Product Dual Pressure Kegerator CO2 Regulators are not is large with an easy to adjust knob which is used to increase or decrease the delivery pressure of CO2. Each of the regulators features a sentry shut-down safety that is built into the body. This instantly protects the dispensing system so that even when the regulator fails, there is a backup.

The outlet has a shut-off along with a backflow check valve and a 5/16-inch I.D hose barb nipple. it comes with a permanent quad-ring seal located on the inlet nipple, this helps to get rid of leaks, it also will not require the use of a fiber washer for each time the tank is changed. Besides, it features a blow-off that is set within the range of 55 to 65 PSIG.

This product is built and tested in conformity with UL standard 252 meant for compressed gas regulators and also UL 252A for compressed gas regulator accessories. This product was passed through a high-quality check and meets with the standard set by MIL-STD-105E. The polycarbonate bonnet which is used in dispersing CO will not chip off, fade or break. It also features 10 Micron filters that is designed to keep contaminants away from the regulator. it has one pair of kit for primary regulators and another for secondary regulators.


  • It has an adjustable knob to control the flow of CO2
  • It is well tested and conforms to relevant regulatory bodies
  • It is durable
  • It is easy to use


  • It contains some cancerous chemicals
  • It is not cheap

5. MRbrew Keg Regulator CO2, MRbrew Kegerator Regulator

We conclude our list with MRbrew Keg Regulator CO2, MRbrew Kegerator Regulator. It is a brewery-grade keg of CO2 regulator that features a multiple-stage body to give a more precise control when small adjustments are being made to the output pressure. There’s also a lock ring located under the adjustment knob which can be quickly locked without the need for readjustment while also maintaining the CO2 pressure.

With these products you won’t experience any leaks, the transmission is fast and easy too. All that is needed to install this beer keg regulator is an adjustable wrench. You should always put a washer in-between the tank and the lock-down nut to ensure its tightly sealed.

Furthermore, it features an easy to adjust knob and also easy-to-read dual-gauge that has 45 PSI safety relief valve and also a gas-shut valve, there is MRBrew regulator for regerator. This has been specifically designed to provide convenience and durability in busy environments such as restaurants, tasting rooms and bars.


  • It is a heavy-duty regulator
  • It is easy to install and has no leaks
  • It is durable
  • it is sturdy and reliable


  • The price tag is on the high side

How to Setup CO2 Regulator in Grow Room?

To set up a CO2 regulator for your indoor garden, you will need the following materials:

  • 20 pound CO2 tank
  • Tighten control CO2 regulator

The CO2 regulator comes with plastic washers, 12 feet of dispensing tubing and instructions that include flow meter setting and a timing chart.

The CO2 regulator is a device that uses a pinwheel knob to control the flow of the CO2 from the tank to the output tubing and ultimately enriching your garden.

To set up a CO2 regulator take the following steps:

  1. 1
    Attach the regulator to the tank by installing the plastic washer and then securely fasten the brass output to the thoracic connector located on the tank
  2. 2
    Attach a simple CO2 to the bottom of a reflector
  3. 3
    Put the CO2 regulator into either a 24-hour time or into a CO2 monitor-controller
  4. 4
    Once either the 24hour timer or monitor controller is set up correctly, you are ready to enrich your garden with CO2

While installing, take note of the following:

  • Ensure the regulator's face is pointing outward to be easily recognized and monitored
  • For flowering gardens, we recommend CO2 setting between 1200PPM and 1500PPM during daylight periods only
  • For larger rooms, the regulator flow may be very high; in this case, it is recommended you use an inline CO2 heater. this helps to protect the CO2 regulator and ensures it lasts longer
  • The CO2 heater should be placed between the CO2 regulator and the tank. This prevents cracking of the regulator, internal diaphragm and possible regulator freeze-up that occurs with high CO2 flow conditions


Now that we are the end of the review of the Best CO2 Regulator for Grow Room, what do you have to say? I bet you loved the products and thought they are all good. And you will be right in your assessment. They are so good we can’t decide on the best.

We have also shared with you how to install a CO2 regulator and why it’s needed. Loaded with all this information, it’s time not just to purchase but to install and watch your plants grow as they should.

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