# CALEFFI Thermostatic Return Temperature Protection Valve DN 25 1 Inch Male Thread 45°C Setting

**URL:** https://aio.lv/en/product--caleffi-280064--12670167
**Data updated:** 2026-09-12 04:24 (EEST)
**Category:** Other goods
**Manufacturer:** CALEFFI
**Manufacturer code:** 280064
**EAN:** 8016615340662
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 184.99 €
**Prices and availability valid until:** 2026-10-27 23:59
**Price without VAT (21%):** 152.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--caleffi-280064--12670167

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 12.10.2026 | free |
| Pickup points | 15.10.2026 | 1.99 EUR |
| Courier delivery to door | 15.10.2026 | 4.99 EUR |

## Summary description

CALEFFI thermostatic return temperature protection valve, model 280064, designed to prevent excessively low return water temperatures in heating systems. Features DN 25 diameter, 1-inch male threaded connections, and a fixed 45°C temperature setting. This valve helps protect boilers from condensation and thermal shock, ensuring optimal efficiency and extended lifespan for domestic and commercial heating installations.

## Long description

The CALEFFI Thermostatic Return Temperature Protection Valve DN 25 1 Inch Male Thread 45°C Setting is an essential hydraulic component designed to regulate and maintain the minimum return water temperature in heating systems. By preventing cold water from returning directly to the heat generator, this precision-engineered valve protects boilers from harmful flue gas condensation, low-temperature corrosion, and thermal shock. Engineered for reliability, it integrates seamlessly into both domestic and commercial heating installations to optimize overall system efficiency and prolong equipment lifespan.
Advantages
This thermostatic valve provides dependable operational stability by automatically adjusting flow rates based on the temperature of the circulating water. Its fixed 45°C setting ensures that the boiler reaches its optimal operating temperature quickly, reducing startup times and fuel consumption. The robust construction and precision thermal element guarantee long-term durability and consistent performance under standard operating pressures in modern heating circuits.
Suitable for
Biomass boilers and solid fuel heating systems
Standard domestic and commercial hydronic heating installations
Protection of cast iron and steel boilers against condensation
Systems requiring return temperature stabilization
When it may not be suitable
This valve is not designed for systems operating at temperatures significantly exceeding standard heating parameters or those requiring adjustable temperature settings outside the pre-set 45°C threshold. It is also unsuitable for domestic hot water sanitary supply circuits or aggressive fluid environments not compatible with the valve's material specifications.
Key specifications
Nominal diameter: DN 25
Connection type: 1-inch male thread
Fixed temperature setting: 45°C
Manufacturer: Caleffi
How to use
The valve must be installed in the return pipe of the heating circuit according to the directional flow arrows indicated on the valve body, typically between the return line and the boiler inlet or bypass loop. Professional installation by a qualified heating technician is recommended to ensure proper hydraulic balancing and correct positioning of the thermal sensing element relative to the water flow. Regular system checks should be performed to verify unobstructed fluid movement and correct thermal response during operation.
What to consider before purchase
Verify that the DN 25 size and 1-inch male threaded connections match your existing pipe dimensions
Confirm that the fixed 45°C temperature setting aligns with your boiler manufacturer requirements
Check available space in the installation area to ensure proper orientation and accessibility
Usage recommendations: Maintain proper water quality in the heating system and install standard particulate filters upstream to prevent debris accumulation inside the valve mechanism, ensuring long-term operational accuracy and reliability.

## FAQ

### How much does the CALEFFI Thermostatic Return Valve 280064 DN 25 45°C 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 — 15 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 12.10.2026 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 280064 DN 25 45°C 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/12670167/70092591_large.webp