# Thermostatic Angle Set FERRO ZTV21 for Underfloor Heating with GT20 Valve Head, 1/2" Connection

**URL:** https://aio.lv/en/product--ferro-ztv21--11699925
**Data updated:** 2026-03-08 08:45 (EET)
**Category:** Underfloor Heating
**Manufacturer:** FERRO
**Manufacturer code:** ZTV21
**EAN:** 5902194940962
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.49 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 15.28 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-ztv21--11699925

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

FERRO ZTV21 is a thermostatic angle set designed for underfloor heating systems. The kit includes a thermostatic valve assembly for corner installation and a GT20 valve head. It is intended to regulate flow and temperature in radiator/underfloor circuits with 1/2" connections, suitable for precise room temperature control in residential and light-commercial installations.

## Long description

FERRO ZTV21 thermostatic angle set for underfloor heating with GT20 valve head is a compact valve assembly designed for corner installation in underfloor heating manifolds and radiator connections. The kit combines a thermostatic valve body with a GT20 temperature-sensitive head to regulate water flow and maintain desired room temperature. The 1/2" connection size makes it compatible with common piping used in residential and light-commercial underfloor heating circuits, enabling precise control of supply to individual loops or radiators.
Advantages
The thermostatic angle design allows installation in tight spaces and on manifold outlets where a right-angle orientation is required. The GT20 valve head provides automatic, responsive temperature control without external power, reacting to ambient temperature changes to modulate flow. Built for compatibility with 1/2" connections, the set simplifies replacement or retrofit in existing systems and supports stable room climate by reducing temperature fluctuations.
Suitable for
 Individual underfloor heating loops in residential apartments and houses
 Light-commercial underfloor heating circuits where precise zone control is needed
 Retrofit or replacement of existing 1/2" corner-mounted thermostatic valves
 Connections between manifold outlets and heating circuits requiring angle fittings
Key specifications
 Valve type: Thermostatic angle valve assembly with temperature-sensitive head
 Actuator: GT20 thermostatic head (mechanical, temperature-responsive)
 Connection size: 1/2" thread compatible with standard plumbing fittings
 Installation orientation: Corner / angle mounting suitable for manifold outlets
 Control function: Automatic modulation of flow to maintain set room temperature
How to use
Install the thermostatic angle set on the supply or return outlet of the underfloor heating manifold or radiator connection using appropriate 1/2" fittings and sealing. Fit the GT20 valve head onto the valve spindle and set the desired temperature using the head's adjustment scale. Ensure the valve body is oriented correctly for corner mounting and that piping is supported to prevent stress on the connections. Once installed, the GT20 head will modulate the valve automatically in response to ambient temperature changes.
Usage recommendations
For optimal performance, purge the heating circuit to remove air before commissioning and check for proper flow through the controlled loop. Avoid using aggressive sealing compounds on the valve spindle and verify compatibility with system water treatment. Periodic inspection and gentle cleaning of the thermostatic head will help maintain accurate temperature control.

## FAQ

### How much does the FERRO ZTV21 thermostatic angle set with GT20 cost, and is it available for purchase?

The price is 18.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 15.07.2026 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 FERRO 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 FERRO 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/11699925/67083126_large.webp