Controller TECH ST28 SIGMA for solid-fuel boilers

Name: Controller TECH ST28 SIGMA for ST28SIGMABK
Brand: TECH
SKU: 11867798
Price: 140.49 EUR
Availability: OutOfStock

JBL – powerful sound always with you

JBL speakers and headphones for pure and deep sound!

Controller TECH ST28 SIGMA for solid-fuel boiler — fan, CO and DHW pump control, automatic fan speed regulation, black

Short description

TECH ST28 SIGMA is a controller designed for solid-fuel (loading) boilers to manage a combustion fan and central heating (CO) plus domestic hot water (DHW/CWU) pumps. The unit provides automatic fan speed regulation based on boiler conditions, coordinating pump switching and safety inputs. It is intended for retrofit or new installations to automate combustion air and pump control in residential boiler systems.

Warranty: 2 Years

SKU: 11867798

Manufacturer: TECH

Information regarding the items availability for purchase will be posted on this site

Item cost information will be published on this site

You saving {{productBundleYouSave | formatAmount}}

Product information

Description

TECH ST28 SIGMA is a controller engineered for solid-fuel (loading) boilers to automate the operation of a combustion fan and pumps for central heating (CO) and domestic hot water (DHW). The device monitors basic boiler conditions and adjusts fan speed automatically to maintain efficient combustion while coordinating pump activation and responding to safety inputs. The compact black enclosure is suitable for retrofit upgrades or new installations in residential heating systems.

Advantages

The controller provides automatic fan speed regulation that adapts to changing boiler conditions, reducing manual intervention and improving combustion stability. Integrated pump control for CO and DHW simplifies wiring and system logic by sequencing pump operation according to boiler output and temperature signals. Safety inputs and interlocks allow the unit to respond to fault conditions, supporting safer operation of solid-fuel installations. The device’s compact design and standard electrical connections make it practical to install in existing boiler rooms or new systems.

Suitable for

Solid-fuel (loading) boiler automation in single-family homes
Retrofit projects to add fan and pump control to existing boilers
New residential boiler installations requiring coordinated fan and pump management
Systems where automatic combustion air regulation is needed for fuel efficiency

Key specifications

Functions: automatic fan speed regulation, CO pump control, DHW pump control, safety inputs
Application: solid-fuel loading boilers for residential heating
Housing: compact enclosed unit in black finish suitable for wall or panel mounting
Interfaces: control outputs for fan and pumps, inputs for temperature and safety sensors
Control logic: coordinated sequencing between fan and pump outputs based on boiler signals

How to use

Install the controller according to the system wiring diagram provided by the boiler manufacturer or installer, connecting the combustion fan, CO pump, DHW pump and required sensor or safety inputs. Configure or verify default control parameters so the unit recognizes temperature or pressure signals from the boiler and operates the fan and pumps in the intended sequence. After installation, perform a commissioning check to confirm automatic fan speed adjustment, correct pump sequencing and proper response to safety inputs.

Usage recommendations

Use the controller with compatible solid-fuel boilers and fans specified by the system designer. Ensure sensors and safety devices are installed and regularly tested. Commission the unit after installation and include it in routine heating system maintenance to maintain combustion efficiency and safe operation.

Description

Machine translation. Load original

{{highlightedFeature.featureTitle}}:

{{getProductFeatureValueById(product, highlightedFeature.featureId)}}

Customer reviews

Show all reviews

Customer questions

FAQ

What payment options are available?

AiO.lv offers several payment methods: Bank transfer. 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 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

Show all questions