# TECH controller ST-24 for solid-fuel boiler — fan and central heating pump control with automatic RPM regulation, black

**URL:** https://aio.lv/en/product--tech-st24sigmabk--11867844
**Data updated:** 2026-03-09 17:44 (EET)
**Category:** Control Systems
**Manufacturer:** TECH
**Manufacturer code:** ST24SIGMABK
**EAN:** 5901445470937
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 118.49 €
**Prices and availability valid until:** 2026-07-10 23:59
**Price without VAT (21%):** 97.93 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tech-st24sigmabk--11867844

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 01.07.2026 | free |
| Pickup points | 06.07.2026 | 1.99 EUR |
| Courier delivery to door | 06.07.2026 | 4.99 EUR |

## Summary description

TECH ST-24 is a controller designed for solid-fuel (zasypowy) boilers to manage a combustion fan and central heating (CO) pump. It provides automatic RPM regulation for smoother combustion control and pump operation. The unit supports basic boiler automation tasks, improves heat distribution and helps stabilize temperature by adjusting fan and pump speeds according to boiler needs.

## Long description

TECH controller ST-24 for solid-fuel boiler is a compact control unit designed to manage a combustion fan and a central heating (CO) pump in pellet, coal or wood-fired boilers. The device provides automatic RPM regulation to maintain stable combustion and optimal heat distribution. It supports essential boiler automation functions and is intended for retrofit installations as well as new systems where adjustable fan and pump control is required.
Advantages
The ST-24 automatically adjusts fan speed to stabilize combustion parameters and reduce temperature oscillations, while regulating the CO pump to ensure consistent circulation of heated water. Its compact black housing fits typical boiler rooms and simplifies wiring to the fan and pump. By coordinating fan and pump operation, the controller contributes to more even heating and can reduce manual adjustments during operation.
Suitable for
 Solid-fuel boilers using wood, coal or other feedable fuels
 Systems requiring coordinated control of combustion fan and central heating pump
 Retrofit upgrades to add automatic RPM regulation to existing boilers
 Small to medium residential heating installations
Key specifications
 Controls: combustion fan speed regulation and central heating pump control
 Function: automatic RPM regulation for smoother combustion and pump operation
 Housing: compact unit in black color suitable for boiler room installation
 Compatibility: intended for solid-fuel boilers with separate fan and pump circuits
 User interface: basic control and adjustment options for setting desired operating parameters
How to use
Install the TECH ST-24 according to the boiler manufacturer’s wiring diagram and local electrical regulations, connecting the combustion fan and CO pump outputs to the corresponding terminals. Set basic operating parameters following the included manual: configure target RPM ranges or temperature-related control modes as applicable for your boiler. After initial setup, monitor boiler temperature and adjust settings incrementally to achieve stable combustion and proper heat distribution.
Usage recommendations
Use the controller with fans and pumps that match the electrical and mechanical specifications of your heating system. Perform an initial test run and check all safety interlocks and sensors. Regularly inspect connections and verify that the controller’s regulation achieves stable temperatures; consult a qualified technician for complex installations or if the system shows persistent instability.

## FAQ

### How much does the TECH ST-24 controller for solid-fuel boiler cost, and is it available for purchase?

The price is 118.49 € (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 01.07.2026 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 TECH ST-24 controller for solid-fuel boiler 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 TECH 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 TECH 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/11867844/67274239_large.webp