# Anode rod Biawar 21.3 x 700 mm 3/4" for water heaters (21822)

**URL:** https://aio.lv/en/product--biawar-21822--10457674
**Data updated:** 2026-03-07 15:19 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** Biawar
**Manufacturer code:** 21822
**EAN:** 5901862141038
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 35.49 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 29.33 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--biawar-21822--10457674

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.99 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

Replacement magnesium anode rod Biawar, model 21822, with dimensions 21.3 mm diameter and 700 mm length and 3/4" thread. Designed to protect steel water heater tanks from corrosion by sacrificial oxidation. Suitable for maintenance and prolonging lifespan of domestic and commercial hot water boilers where a 3/4" anode connection and these dimensions are required.

## Long description

Replacement magnesium anode rod Biawar 21.3 x 700 mm with 3/4" thread is designed to protect steel water heater tanks from corrosion by acting as a sacrificial anode. The rod’s 21.3 mm diameter and 700 mm length fit heaters that require these dimensions and a 3/4" connection. Made for routine maintenance, this anode rod reduces oxidation of the tank lining and helps extend the operational life of domestic and commercial hot water boilers where a compatible anode connection is present.
Advantages
The magnesium composition provides effective galvanic protection for steel tanks, accelerating corrosion of the rod instead of the tank. The standard 3/4" threaded connection ensures compatibility with many water heaters that accept screw-in anodes. With its specified diameter and length, the rod reaches deep enough into the tank to protect a large portion of the interior surface. The design allows straightforward replacement during scheduled maintenance and helps maintain hot water quality by limiting rust formation.
Suitable for
 Domestic water heaters with a 3/4" anode port and compatible internal dimensions
 Commercial hot water boilers requiring a 700 mm sacrificial anode
 Routine maintenance and corrosion prevention of steel storage tanks
 Replacement of worn or consumed magnesium anode rods
Key specifications
 Material: magnesium anode core
 Diameter: 21.3 mm
 Length: 700 mm
 Thread type: 3/4" screw-in connection
 Function: sacrificial corrosion protection for steel tanks
How to use
Turn off the water heater and isolate electrical or gas supply according to the manufacturer's safety instructions. Drain the tank to the level below the anode opening if required. Unscrew the old anode rod using the appropriate tool, taking care to support weight and avoid spilling water. Insert the Biawar magnesium anode rod and screw it into the 3/4" port until properly seated and sealed. Refill the tank, restore power or gas, and check for leaks at the connection. Periodic inspection of the anode rod is recommended; replace it when significantly corroded or consumed.
Usage recommendations
For reliable protection, inspect the anode rod every 1–3 years depending on water quality and usage. In hard water areas or high usage installations, consider more frequent checks. Use appropriate sealing materials on the thread if required by the water heater manufacturer and follow all safety precautions when working with pressurized or energized equipment.

## FAQ

### How much does the Anode rod Biawar 21.3x700 mm 3/4" (21822) cost, and is it available for purchase?

The price is 35.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Biawar products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Biawar service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/10457674/52490011_large.webp