# Caleffi thermostatic return temperature protection valve, DN 25, 1" external thread, 70°C setting

**URL:** https://aio.lv/en/product--caleffi-280067--12606126
**Data updated:** 2026-07-31 04:14 (EEST)
**Category:** Other goods
**Manufacturer:** CALEFFI
**Manufacturer code:** 280067
**EAN:** 8016615340693
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 184.99 €
**Prices and availability valid until:** 2026-10-30 23:59
**Price without VAT (21%):** 152.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--caleffi-280067--12606126

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.10.2026 | free |
| Pickup points | 20.10.2026 | 1.99 EUR |
| Courier delivery to door | 20.10.2026 | 4.99 EUR |

## Summary description

Caleffi thermostatic protection valve designed to prevent excessively low return temperatures in heating systems. Features a DN 25 connection size with 1-inch external threads and a fixed temperature setting of 70°C. Ideal for optimizing boiler efficiency, preventing condensation, and protecting against thermal shock in modern heating installations.

## Long description

The Caleffi thermostatic return temperature protection valve is an essential component designed to prevent excessively low return temperatures in heating systems. Featuring a DN 25 connection size with 1-inch external threads and a fixed temperature setting of 70°C, this device ensures optimal thermal management. It is specifically engineered to optimize boiler efficiency, prevent harmful condensation formation, and protect against thermal shock in modern heating installations, thereby extending the lifespan of the heating equipment.
Advantages
This thermostatic valve provides reliable and automatic regulation of the water returning to the boiler without requiring an external power supply. By maintaining a stable return temperature, it effectively stops corrosive condensation from forming on the internal heat exchanger surfaces. Its robust construction ensures long-term durability and consistent performance, while the standardized connections facilitate straightforward integration into existing or new heating circuits.
Suitable for
Biomass boilers and solid fuel heating systems
Modern domestic and commercial heating installations
Protection against low-temperature return corrosion
Thermal shock prevention in heat generators
When it may not be suitable
This valve is not designed for cooling systems or applications requiring adjustable, non-fixed temperature settings. It may also be unsuitable for heating circuits where the nominal diameter or flow rate requirements do not match the DN 25 specification.
Key specifications
Nominal diameter: DN 25
Connection type: 1-inch external thread
Fixed temperature setting: 70°C
Function: Thermostatic return temperature protection
How to use
The valve must be installed in the return pipe of the heating circuit, following the directional flow arrows indicated on the valve body. Proper installation ensures that the thermostatic element is correctly exposed to the circulating water temperature. Regular system maintenance should include checking the valve for operational smoothness and ensuring no debris interferes with the internal moving parts.
What to consider before purchase
Verify that the 70°C fixed temperature setting matches your boiler manufacturer requirements
Check that the DN 25 size and 1-inch external thread compatibility align with your piping layout
Ensure sufficient space is available in the return line for proper installation and maintenance access
Usage recommendations: Install the valve according to the manufacturer specifications and local plumbing codes to ensure safe and efficient operation. Periodically inspect the heating system to maintain optimal water quality and prevent scale buildup.

## FAQ

### How much does the Caleffi Thermostatic Return Valve 280067 cost, and is it available for purchase?

The price is 184.99 € (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 15.10.2026 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 Caleffi Thermostatic Return Valve 280067 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 CALEFFI 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 CALEFFI 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/12606126/69834597_large.webp