# Controller TECH ST-27I (TSST27IBK) for 2 pumps — for central heating, domestic hot water or underfloor heating, black

**URL:** https://aio.lv/en/product--tech-tsst27ibk--11960029
**Data updated:** 2026-03-11 13:59 (EET)
**Category:** Control Systems
**Manufacturer:** TECH
**Manufacturer code:** TSST27IBK
**EAN:** 5901445470319
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 104.49 €
**Prices and availability valid until:** 2026-07-08 23:59
**Price without VAT (21%):** 86.36 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--tech-tsst27ibk--11960029

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 29.06.2026 | free |
| Pickup points | 02.07.2026 | 1.99 EUR |
| Courier delivery to door | 02.07.2026 | 4.99 EUR |

## Summary description

TECH ST-27I controller (model TSST27IBK) is a control unit designed for managing two pumps used in central heating (CO), domestic hot water (CWU) or underfloor heating systems. The unit coordinates pump operation to ensure proper circulation and switching between heating circuits. Supplied in black, it is intended for installation in residential or light-commercial heating systems where two independent pump outputs are required.

## Long description

TECH ST-27I controller (model TSST27IBK) is a compact control unit for managing two pumps in central heating (CO), domestic hot water (CWU) or underfloor heating installations. Designed for residential and light-commercial systems, the controller coordinates the operation of two independent pump outputs, enabling correct circulation, timed switching and integrated coordination between heating circuits. The unit is supplied in black and is intended for fixed installation as part of a larger heating control setup.
Advantages
The controller provides reliable two-pump management with straightforward wiring and a compact enclosure suitable for common installation environments. It supports automated switching between circuits to maintain circulation and temperature stability while reducing manual intervention. Built for compatibility with standard pump types used in heating and domestic hot water systems, the device simplifies system integration and reduces the need for multiple separate relays.
Suitable for
 Residential central heating systems with two circulation pumps
 Domestic hot water (CWU) systems requiring coordinated pump control
 Underfloor heating installations with dual-zone or pumped circuits
 Light-commercial buildings with separate heating circuits
Key specifications
 Control channels: two independent pump outputs for coordinated operation
 Intended applications: central heating (CO), domestic hot water (CWU), underfloor heating
 Housing color: black
 Mounting: fixed installation suitable for boiler rooms or distribution cabinets
 Electrical interfaces: relay outputs compatible with standard pump control voltages
How to use
Install the controller according to local electrical and building regulations, connecting supply power and the two pump outputs to the corresponding terminals. Integrate sensor inputs and any external control signals as required by the heating system design so the unit can coordinate pump switching and circulation. After wiring, commission the controller by verifying correct pump activation and switching behaviour during normal and demand conditions. Routine checks of electrical connections and pump operation ensure continued reliable performance.
Usage recommendations
For reliable operation, pair the controller with pumps and sensors that match the system voltage and specifications, protect the unit with appropriate circuit protection, and follow manufacturer or installer guidance for mounting location to avoid excessive moisture or heat exposure.

## FAQ

### How much does the TECH ST-27I controller for 2 pumps cost, and is it available for purchase?

The price is 104.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 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 29.06.2026 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-27I controller for 2 pumps 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/11960029/67405456_large.webp