# Valve Top-Therm QSD25 DN 25 — anti-freeze safety valve for heating systems

**URL:** https://aio.lv/en/product--top-therm-qsd25--11854390
**Data updated:** 2026-03-09 17:30 (EET)
**Category:** Heating Radiators
**Manufacturer:** Top-Therm
**Manufacturer code:** QSD25
**EAN:** 5904806192080
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 79.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 65.69 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--top-therm-qsd25--11854390

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

Top-Therm QSD25 DN 25 is an anti-freeze safety valve designed for heating systems. Model QSD25 (DN 25) provides protection against freezing by releasing or admitting fluid as system conditions require. Suitable for installation in residential or commercial boiler and radiator circuits to prevent pipe or component damage during low-temperature conditions.

## Long description

Top-Therm QSD25 DN 25 is an anti-freeze safety valve engineered for heating systems to reduce the risk of pipe and component damage under low-temperature conditions. Designed for use in boiler and radiator circuits, this DN 25 valve operates by releasing or admitting fluid automatically as system pressure and temperature change, helping maintain circulation and prevent freezing without manual intervention.
Advantages
The Top-Therm QSD25 DN 25 offers automatic protection against freezing through reliable pressure- and temperature-responsive operation. Its compact DN 25 form factor fits standard residential and commercial heating installations and requires minimal maintenance due to a straightforward mechanical design. The valve contributes to system longevity by preventing burst pipes and damage to heat exchangers and radiators during cold periods.
Suitable for
 Residential boiler circuits and radiator loops
 Commercial heating installations with DN 25 connections
 Systems requiring passive anti-freeze protection in low ambient temperatures
Key specifications
 Nominal diameter: DN 25
 Function: anti-freeze / safety valve for heating systems
 Operating principle: automatic pressure/temperature-responsive opening and closing to admit or release fluid
 Installation type: in-line connection suitable for standard heating circuits
 Typical applications: boiler and radiator circuits in residential and commercial systems
How to use
Install the valve in the heating circuit at a location recommended by the heating system designer or installer, ensuring correct flow orientation and secure connections to DN 25 pipework. The device works automatically: under low-temperature or altered pressure conditions it will release or admit fluid as required to prevent freezing. Regular visual checks and periodic inspection during service intervals are recommended to confirm correct operation and tight connections.
Usage recommendations
Ensure installation is performed by a qualified technician familiar with local regulations and heating system layouts. Verify compatibility with system fluids and operating pressures before fitting. During commissioning and winter months, include the valve in routine maintenance checks to confirm functionality and to prevent obstruction from debris or corrosion.

## FAQ

### How much does the Top-Therm QSD25 DN 25 anti-freeze valve cost, and is it available for purchase?

The price is 79.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 31 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 15.07.2026 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 Top-Therm QSD25 DN 25 anti-freeze valve 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 Top-Therm 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 Top-Therm 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/11854390/67252741_large.webp