# Temperature sensor Heiztechnik CVA304 for hot water cylinder (CWU) — immersion probe 5 m cable

**URL:** https://aio.lv/en/product--heiztechnik-cva304--12014000
**Data updated:** 2026-03-11 20:48 (EET)
**Category:** Smart Sensors
**Manufacturer:** Heiztechnik
**Manufacturer code:** CVA304
**EAN:** 5907548207661
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 15.69 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--heiztechnik-cva304--12014000

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Heiztechnik CVA304 is a temperature sensor designed for CWU (domestic hot water) systems. It is an immersion-style probe intended to monitor water temperature in cylinders or storage tanks, featuring a 5 m cable for flexible placement. The sensor provides reliable temperature measurement for control and safety of heating and hot water systems and is suitable for integration with controllers, boilers and circulation systems.

## Long description

Heiztechnik CVA304 is an immersion temperature sensor designed for domestic hot water (CWU) cylinders and storage tanks. The probe monitors water temperature to support control and safety functions in heating and hot water systems. With a 5 m cable, the sensor allows flexible placement and connection to controllers, boilers, or circulation systems where accurate temperature feedback is required.
Advantages
The immersion design enables direct sensing of tank water temperature for faster and more representative measurements compared with air sensors. The 5 m cable offers extended reach to connect the probe to nearby controllers or control cabinets without additional extension. The sensor is compatible with standard CWU system connections and provides stable temperature feedback suitable for regulation and safety cut-off functions.
Suitable for
Monitoring temperature in domestic hot water cylinders and storage tanks
Integration with heating system controllers and boilers for temperature regulation
Use in circulation systems to control pumps or mixing valves
Replacement or retrofit of existing immersion temperature probes in CWU installations
Key specifications
Immersion probe design for direct water contact in tanks or cylinders
5 m cable length for flexible routing and connection
Designed for use in domestic hot water (CWU) systems
Compatible with standard control and boiler inputs requiring temperature feedback
How to use
Install the immersion probe into the designated pocket or well on the hot water cylinder, ensuring the sensing tip is positioned at the recommended depth for representative measurement. Route the 5 m cable to the control unit or boiler input, avoiding sharp bends and locations with mechanical strain. Connect the sensor leads to the appropriate temperature input on the controller or boiler according to the equipment wiring diagram, then secure cable entries to maintain a watertight installation where required. After connection, verify correct operation by comparing displayed temperature values with an independent thermometer or system diagnostics.
Usage recommendations
For reliable long-term operation, use the probe in the intended CWU environment and avoid exposure to chemicals or conditions outside the equipment’s specified operating range. Protect the cable from mechanical damage and secure termination points to prevent water ingress. During installation or replacement, follow the boiler or controller manufacturer’s wiring and grounding guidelines and perform a system test to confirm correct temperature sensing and control responses.

## FAQ

### How much does the Temperature sensor Heiztechnik CVA304 cost, and is it available for purchase?

The price is 18.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 07.07.2026 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 Heiztechnik 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 Heiztechnik 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/12014000/67502839_large.webp