# Thermostatic valve insert DANFOSS AVTB20 with union connection, 3/4" female thread, sensor Ø9.5×155 mm, adjustable 30–100°C, kvs 3.4

**URL:** https://aio.lv/en/product--danfoss-003n8142--12066913
**Data updated:** 2026-03-12 21:46 (EET)
**Category:** Heating Radiators
**Manufacturer:** DANFOSS
**Manufacturer code:** 003N8142
**EAN:** 5702421100745
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 535.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 442.55 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--danfoss-003n8142--12066913

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Thermostatic valve insert DANFOSS AVTB20 designed for hydraulic balancing and temperature control in heating systems. Features a union (muff) connection with 3/4" female thread, capillary sensor Ø9.5×155 mm and adjustable setpoint range 30–100°C. Flow characteristic kvs 3.4 ensures defined flow for radiator or convector applications. Suitable for replacement or new installations.

## Long description

Thermostatic valve insert DANFOSS AVTB20 with union connection is designed for hydraulic balancing and reliable temperature control in hot water heating systems. The insert features a 3/4" female thread union connection and a capillary sensor with dimensions Ø9.5×155 mm. The adjustable setpoint range from 30 to 100 °C and a flow characteristic with kvs 3.4 provide a defined flow control suitable for radiator and convector applications. The compact design allows use as a replacement part or in new installations where precise temperature regulation and system balancing are required.
Advantages
The thermostatic insert provides accurate temperature control through an adjustable setpoint range while the capillary sensor enables remote temperature sensing. Its union connection with 3/4" female thread simplifies installation and replacement without extensive pipework modifications. The kvs 3.4 flow characteristic delivers predictable hydraulic behaviour that supports stable room temperatures and easier system balancing. The product is compatible with standard radiator and convector valves used in residential and light commercial heating systems.
Suitable for
Hydraulic balancing of radiator and convector circuits
Temperature control in hot water heating systems
Replacement of existing thermostatic valve inserts with compatible union connections
New installations requiring defined flow characteristics and remote sensing
Key specifications
Connection type: union (muff) with 3/4" female thread
Sensor: capillary type, dimensions Ø9.5×155 mm
Adjustable temperature setpoint range: 30–100 °C
Flow characteristic: kvs 3.4
Application: radiator and convector heating circuits
How to use
Install the thermostatic valve insert into a compatible valve body using the 3/4" female thread union connection, ensuring the sealing surfaces are clean and properly aligned. Position the capillary sensor so it accurately senses the medium temperature; avoid tight bends and kinks in the capillary. Adjust the setpoint to the required temperature within the 30–100 °C range according to system design and comfort needs. Commission the system and perform hydraulic balancing as required to achieve stable flow distribution across radiators or convectors.
Usage recommendations
For reliable operation, use the insert in systems with compatible valve bodies and ensure regular inspection of connections and the capillary sensor. When replacing an existing insert, verify thread compatibility and sensor length to match installation requirements. Follow system manufacturer guidelines for hydraulic balancing and temperature setpoint selection.

## FAQ

### How much does the DANFOSS AVTB20 thermostatic valve insert cost, and is it available for purchase?

The price is 535.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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 16.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can DANFOSS AVTB20 thermostatic valve insert be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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 DANFOSS 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 DANFOSS 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/12066913/67552139_large.webp