# Temperature regulator FF RT-821 — room thermostat controller RT-821

**URL:** https://aio.lv/en/product--ff-rt-821--12115888
**Data updated:** 2026-03-20 17:55 (EET)
**Category:** Control Systems
**Manufacturer:** FF
**Manufacturer code:** RT-821
**EAN:** 5908312595717
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 41.99 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 34.70 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-rt-821--12115888

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

FF RT-821 is a temperature regulator and room thermostat designed to control heating systems. The unit provides manual setpoint adjustment for maintaining desired ambient temperature, with basic control functions suitable for residential heating circuits, boilers or electric heaters. Intended for indoor installation to regulate temperature and improve comfort and energy use.

## Long description

FF RT-821 is a room temperature regulator designed for indoor installation to control heating systems. The device provides manual setpoint adjustment and basic on/off control suitable for residential heating circuits, boilers and electric heaters. It monitors ambient temperature and drives a heating output to maintain the selected setpoint, helping to stabilize room temperature and support energy-efficient operation of domestic heating equipment.
Advantages
The RT-821 offers straightforward manual temperature control with a clear user interface that allows quick setpoint changes. Its simple on/off regulation is compatible with common heating devices and installation scenarios, providing reliable switching action for valves, relays or contactors. The compact design and indoor mounting make it easy to integrate into existing heating systems without requiring complex configuration or additional control equipment.
Suitable for
Control of residential boiler and furnace systems
Switching electric heaters or convectors
Room temperature regulation for apartments and houses
Integration with heating circuits that require basic on/off thermostat control
Key specifications
Function: Manual room temperature regulator with on/off control
Installation: Indoor wall mounting
Control output: Relay/contact switching for heating loads
Setpoint: Manual adjustment for desired ambient temperature
Sensing: Built-in ambient temperature sensor
Compatibility: Suitable for boilers, electric heaters and heating circuits with binary control
How to use
Mount the RT-821 on an interior wall away from direct sunlight, drafts and heat sources for accurate ambient sensing. Connect the regulator output to the heating device’s control input (relay, valve actuator or contactor) following applicable wiring standards and safety regulations. Adjust the setpoint control to the desired temperature; the regulator will switch the heating output on or off to maintain the selected level. Periodically inspect electrical connections and the device housing for proper condition.
Usage recommendations
For accurate control, install the unit at typical room height and avoid locations close to windows, doors or radiators. Use the thermostat for applications requiring straightforward on/off regulation; for systems needing modulation or advanced schedules, consider a controller with proportional control or programmable features. Ensure wiring and mounting are performed by a qualified person in accordance with local electrical codes.

## FAQ

### How much does the Temperature regulator FF RT-821 cost, and is it available for purchase?

The price is 41.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 40 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 03.07.2026 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 FF 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 FF 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/12115888/67651045_large.webp