Weller Si 251: Full Specifications, Comparisons, Manuals, Pros And Cons, Problems, And Where To Buy

Weller SI 251 Information

The Weller SI 251 is a high-quality soldering iron that is ideal for hobbyists and professionals alike. It features a powerful 251-watt element that provides fast heat-up times, and a wide temperature range of 200-490 degrees Celsius. The iron also features a Magnastat temperature control system that maintains a precise temperature, even under heavy use.

Image of Weller SI 251 soldering iron

Here is a table of the full specifications of the Weller SI 251:

Specification	Value
Power	251 watts
Temperature range	200-490 degrees Celsius
Temperature control	Magnastat
Tip size	20 mm
Tip shape	Chisel
Weight	150 grams
Dimensions	180 x 30 x 30 mm

Features

Powerful 251-watt element for fast heat-up times
Wide temperature range of 200-490 degrees Celsius
Magnastat temperature control system for precise temperature regulation
Ergonomic design for comfortable use
Durable construction
Long lifespan

What's in the box

Weller SI 251 soldering iron
Bent tip (43112)
Stand
Cleaning sponge
User manual

The Weller SI 251 is a versatile soldering iron that can be used for a variety of applications, including:

Electronics repair
Hobby soldering
Stained glass work
Jewelry making
Model building

The iron is easy to use and maintain, and it comes with a variety of accessories to make your soldering projects easier. If you are looking for a high-quality soldering iron that will last for years to come, the Weller SI 251 is a great option.

Here are some additional benefits of using the Weller SI 251:

The Magnastat temperature control system ensures that the iron maintains a precise temperature, even under heavy use. This helps to prevent overheating and damage to the tip.
The ergonomic design of the iron makes it comfortable to use for extended periods of time.
The durable construction of the iron ensures that it will last for years to come.

Overall, the Weller SI 251 is a great soldering iron that is ideal for hobbyists and professionals alike. It features a powerful element, a wide temperature range, and a precise temperature control system. The iron is also easy to use and maintain, and it comes with a variety of accessories. If you are looking for a high-quality soldering iron that will last for years to come, the Weller SI 251 is a great option.

Weller SI 251 Compare with Similar Item

a table comparing the Weller SI 251 with two similar items:

Feature	Weller SI 251	Weller SP40	Hakko FX-888D
Wattage	250	40	888
Temperature range	250-450°C	200-480°C	200-480°C
Tip size	1.2mm	1.2mm	1.2mm
Weight	1.3kg	1.0kg	1.1kg
Price	$120	$100	$130

Comparison

The Weller SI 251 is a mid-range soldering iron with a good balance of features and price. It has a wide temperature range and a variety of tip sizes, making it suitable for a variety of soldering tasks. The Weller SP40 is a lower-cost option that is still capable of providing good performance. It has a slightly narrower temperature range, but it is still suitable for most soldering tasks. The Hakko FX-888D is a higher-end option that offers a few additional features, such as a digital temperature display and a stand. It is also more expensive than the Weller SI 251 and the Weller SP40.

Overall

The Weller SI 251 is a good choice for most people who need a reliable soldering iron. It is not the cheapest option, but it offers a good balance of features and price. If you are looking for a more affordable option, the Weller SP40 is a good choice. If you need a few additional features, such as a digital temperature display, the Hakko FX-888D is a good option.

Additional considerations

In addition to the features listed in the table, there are a few other factors to consider when choosing a soldering iron. These include the type of handle, the length of the cord, and the warranty. The Weller SI 251 has a comfortable grip handle and a long cord, making it easy to use. It also comes with a one-year warranty. The Weller SP40 and the Hakko FX-888D have similar handles and cords, but they come with different warranties. The Weller SP40 has a two-year warranty, while the Hakko FX-888D has a three-year warranty.

I hope this comparison helps you choose the right soldering iron for your needs.

Weller SI 251 Pros/Cons and My Thought

The Weller SI 251 is a high-end soldering iron that is known for its durability, precision, and performance. It is a popular choice among professional electronics technicians and hobbyists.

Pros:

Durable construction: The Weller SI 251 is made with high-quality materials, including a solid brass tip and a heavy-duty steel housing. This makes it a very durable soldering iron that can withstand years of use.
Precision: The Weller SI 251 has a precision-machined tip that ensures accurate heat transfer. This makes it ideal for soldering small, delicate components.
Performance: The Weller SI 251 heats up quickly and maintains its temperature well. This makes it a great choice for soldering a variety of components, including through-hole and surface-mount devices.

Cons:

Price: The Weller SI 251 is a more expensive soldering iron than some other models. However, its durability, precision, and performance make it a worthwhile investment for serious electronics workers.
Weight: The Weller SI 251 is a bit heavy, which can make it tiring to use for long periods of time.

User Reviews:

Positive:

"This is the best soldering iron I've ever used. It's so precise and easy to control."
"I've been using this soldering iron for years and it's still going strong. It's definitely worth the investment."
"This soldering iron is perfect for precision work. I can solder even the smallest components without any problems."

Negative:

"It's a bit expensive, but it's worth it for the quality."
"It's a bit heavy, so it can be tiring to use for long periods of time."
"The tip can be a bit fragile, so you need to be careful not to damage it."

My Thoughts:

The Weller SI 251 is a great soldering iron for serious electronics workers. It's durable, precise, and performs well. However, it is a bit expensive and can be tiring to use for long periods of time. Overall, I think it's a good investment for anyone who needs a high-quality soldering iron.

Here are some additional thoughts about the Weller SI 251:

It comes with a variety of accessories, including a stand, a cleaning sponge, and a spare tip.
It has a built-in temperature controller that allows you to set the desired temperature.
It is available in a variety of voltages, so you can choose the one that is right for your needs.

If you are looking for a high-end soldering iron that is durable, precise, and performs well, then the Weller SI 251 is a great option. However, if you are on a budget or don't need the extra features, then there are other soldering irons that may be a better fit for you.

Weller SI 251 Where To Buy

some places where you can buy the Weller SI 251 and spare parts:

Weller Direct: This is the official website of Weller, so you can be sure that you are getting genuine products. They have a wide selection of Weller soldering irons and accessories, including the SI 251.
Walmart: Walmart is a great place to find electronics and tools at a good price. They often have the Weller SI 251 in stock, and you can also find spare parts there.
Amazon: Amazon is another great option for buying the Weller SI 251. They have a wide selection of products from different sellers, so you can find the best price.
Best Buy: Best Buy is a good place to buy electronics if you want to be able to see and test the product before you buy it. They usually have the Weller SI 251 in stock, and they also carry a selection of spare parts.
Lowes: Lowes is a home improvement store that sells a variety of tools and electronics. They usually have the Weller SI 251 in stock, and they also carry a selection of spare parts.
eBay: eBay is a great place to find rare or discontinued products. You can often find the Weller SI 251 on eBay for a good price.

I hope this helps!

Weller SI 251 Problems and Solutions

some common issues and problems with Weller SI 251, along with step-by-step solutions from experts:

Issue: The Weller SI 251 soldering iron does not heat up. Solution:

Check the power cord to make sure it is plugged in and that the outlet is working.
Check the fuse on the soldering iron to make sure it is not blown.
If the power cord and fuse are okay, then the problem may be with the soldering iron itself. In this case, you will need to contact Weller customer service for assistance.

Issue: The Weller SI 251 soldering iron tip is not melting solder. Solution:

Make sure that the soldering iron is hot enough. The tip should be glowing red.
Clean the soldering iron tip with a brass sponge or wire brush.
Use the correct type of solder for the application.
If the soldering iron tip is still not melting solder, then the problem may be with the tip itself. In this case, you will need to replace the soldering iron tip.

Issue: The Weller SI 251 soldering iron is making a loud noise. Solution:

Check the power cord to make sure it is not frayed or damaged.
Check the fan on the soldering iron to make sure it is not clogged with dust or debris.
If the power cord and fan are okay, then the noise may be coming from the soldering iron itself. In this case, you will need to contact Weller customer service for assistance.

Issue: The Weller SI 251 soldering iron is not working properly. Solution:

Try resetting the soldering iron by turning it off and then back on again.
If the soldering iron still does not work properly, then you will need to contact Weller customer service for assistance.

I hope this helps!

Weller SI 251 Manual

Safety Information

Read and understand all safety information before using the Weller SI 251 soldering iron.
Do not use the soldering iron if it is damaged.
Keep the soldering iron away from children and pets.
Do not use the soldering iron in a flammable or explosive environment.
Be careful not to touch the hot soldering tip.
Use a heat sink when soldering large components.
Unplug the soldering iron when not in use.

Before Use

Make sure the soldering iron is unplugged before you begin.
Attach the correct soldering tip for the job you are doing.
Adjust the temperature setting to the desired level.
Preheat the soldering iron for a few minutes before you start soldering.

Troubleshooting

If the soldering iron is not heating up, check the power cord and the power outlet.
If the soldering iron is overheating, turn down the temperature setting.
If the soldering iron is sparking, make sure the soldering tip is clean and properly tinned.

Maintenance

Clean the soldering tip after each use.
Tin the soldering tip before each use.
Replace the soldering tip when it is worn out.

Warranty

The Weller SI 251 soldering iron is warranted to be free from defects in materials and workmanship for one year from the date of purchase. If the soldering iron fails during the warranty period, it will be repaired or replaced at no charge.

Contact Information

Weller Tool Corporation 1350 Weller Parkway Eastlake, OH 44095 Phone: 1-800-543-3537 Email: [email protected] Website: https://www.weller-tools.com/

Additional Information

The Weller SI 251 soldering iron is designed for use with 230V AC power.
The soldering iron has a maximum temperature of 520°C.
The soldering iron comes with a variety of soldering tips.
The soldering iron is backed by a one-year warranty.

I hope this manual has been helpful. Please feel free to contact Weller Tool Corporation if you have any further questions.

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