Frequently Asked Questions

ASIC (Application-Specific Integrated Circuit) miners are hardware devices designed specifically for cryptocurrency mining. Unlike GPUs which are general-purpose, ASICs are built for a single mining algorithm, offering significantly higher hashrate and energy efficiency. For example, a modern Bitcoin ASIC miner can deliver 200+ TH/s while consuming around 3,000W of power.

Hashrate measures the computational power of a miner, expressed in hashes per second (H/s). Higher hashrate means more chances of solving blocks and earning mining rewards. Common units include TH/s (terahashes), GH/s (gigahashes), and MH/s (megahashes). When comparing miners, hashrate relative to power consumption (efficiency) is the key metric.

Mining efficiency is measured in joules per terahash (J/TH). It tells you how much energy a miner uses per unit of computational work. Lower J/TH means better efficiency. For example, a miner rated at 15 J/TH is more efficient than one rated at 25 J/TH. Efficiency directly impacts your electricity costs and profitability.

Different ASIC miners are designed for different algorithms. SHA-256 miners (like Antminer S21) mine Bitcoin (BTC) and Bitcoin Cash (BCH). Scrypt miners mine Litecoin (LTC) and Dogecoin (DOGE). Equihash miners mine Zcash (ZEC). KHeavyHash miners mine Kaspa (KAS). Each miner is only compatible with coins sharing the same algorithm.

Mining profitability depends on four factors: your miner's hashrate, power consumption, electricity cost, and the current coin price/network difficulty. Use our real-time profitability calculator on the homepage to estimate daily earnings. We factor in electricity costs (default $0.045/kWh) and show net profit after deducting power expenses.

Consider these factors: (1) Which cryptocurrency you want to mine — this determines the algorithm. (2) Your electricity cost — lower rates make less efficient miners viable. (3) Budget — balance upfront cost vs daily earnings. (4) Noise and heat — some miners produce 75+ dB. (5) Cooling method — air-cooled vs hydro-cooled. Use our profitability calculator to compare specific models.

Air-cooled miners use fans to dissipate heat and are simpler to set up but louder (65-80 dB). Hydro-cooled (water-cooled) miners use liquid cooling, run quieter, can achieve higher hashrates, and are more energy efficient, but require plumbing infrastructure and are more expensive. Hydro models are ideal for large-scale operations.

New miners come with a 1-year manufacturer warranty and the latest efficiency. Used miners are cheaper upfront but may have worn components and shorter lifespan. Check our product listings — we clearly label condition (new, used, refurbished) and adjust pricing accordingly. For beginners, new miners are recommended for reliability.

We are an authorized dealer for major ASIC manufacturers including Bitmain (Antminer series), MicroBT (WhatsMiner series), Canaan (Avalon series), Goldshell, IceRiver, Innosilicon, and Bitdeer (SealMiner series). All units are sourced directly from manufacturers or authorized distributors.

We accept Visa, Mastercard, PayPal, and cryptocurrency payments (Bitcoin, Ethereum, Litecoin, USDT, and more via CoinPal). For large orders, we also support bank wire transfers. All payments are processed through secure, PCI-DSS compliant payment processors.

Yes, we offer bulk order discounts for mining farms and large-scale operations. Contact us at info@leedminer.com with your requirements (model, quantity, delivery timeline) and we will provide a custom quote. Bulk orders may also qualify for priority shipping and dedicated account management.

Orders can be cancelled for a full refund before the product has been shipped. Once shipped, cancellation is not possible but you may be eligible for a return. Contact info@leedminer.com as soon as possible if you need to cancel.

Standard international shipping takes 7-14 business days. Express shipping options are available for 3-5 business day delivery. All orders include tracking numbers. Delivery times may vary depending on destination country and customs processing.

Yes, we offer free worldwide shipping on most orders. Some oversized items (like mining containers) or remote destinations may incur additional shipping charges, which will be clearly shown at checkout before payment.

Yes, we ship to over 70 countries worldwide including the United States, Canada, Europe, Middle East, Southeast Asia, Africa, and South America. Import duties and taxes may apply depending on your country's regulations. These are the responsibility of the buyer.

All warranties follow the official manufacturer's policy. Brand new miners come with a 1-year (12 months) manufacturer warranty. Used and refurbished miners do not carry warranty unless specifically stated on the product page. LeedMiner assists with coordinating warranty claims with the manufacturer.

If your miner arrives with visible shipping damage, document it with photos before opening the package and contact us within 48 hours. Do not discard the original packaging. All shipments are insured, and we will handle the claim process on your behalf.

Due to the specialized nature of mining equipment and rapid cryptocurrency price fluctuations, we do not accept returns for change of mind. Please carefully review product specifications, profitability estimates, and your setup requirements before purchasing.

Basic setup involves: (1) Place the miner in a well-ventilated area. (2) Connect the power supply (PSU) to the miner and a suitable power outlet. (3) Connect the miner to your network via Ethernet cable. (4) Access the miner's web interface through your browser to configure your mining pool and wallet address. We provide setup guides for popular models.

Most ASIC miners require 220V/240V power supply (standard in most countries outside North America). Some smaller models work on 110V. Check the product specifications for exact voltage and amperage requirements. We recommend using a dedicated circuit breaker for each miner to prevent electrical issues.

You can reach our support team via email at info@leedminer.com, WhatsApp at +86 133 5291 7253, or through our website contact form. We respond within 24 hours on business days. For urgent technical issues, WhatsApp is the fastest channel.