# Differential pressure valve for central heating FERRO ZR3 6/4"

**URL:** https://aio.lv/en/product--ferro-zr3--11835990
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Heating Radiators
**Manufacturer:** FERRO
**Manufacturer code:** ZR3
**EAN:** 5901095641305
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-zr3--11835990

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.99 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

FERRO ZR3 is a differential pressure valve designed for central heating systems with a 6/4" connection. The valve maintains stable differential pressure to protect circulator pumps and balance flows between circuits. Suitable for residential and light commercial heating installations to reduce hydraulic noise, prevent unwanted flow variations and improve system stability.

## Long description

FERRO ZR3 differential pressure valve with a 6/4" connection is designed for central heating systems where stable hydraulic balance and pump protection are required. The valve automatically limits and maintains a set differential pressure across radiators or heating circuits, reducing flow variations and hydraulic noise while helping to stabilize system operation in residential and light commercial installations.
Advantages
The FERRO ZR3 valve ensures consistent differential pressure, which helps protect circulator pumps from overload and cavitation and reduces unwanted flow through thermostatic radiator valves. Its 6/4" connection supports common piping sizes used in domestic and small commercial systems. By limiting pressure fluctuations, the valve contributes to quieter operation and more even heat distribution without active control electronics.
Suitable for
Residential central heating systems with multiple radiator circuits
Light commercial heating installations requiring hydraulic balancing
Systems where reduction of hydraulic noise and pump protection is needed
Renovation projects replacing uncontrolled flow components
Key specifications
Function: differential pressure limiting valve for central heating
Connection size: 6/4" compatible with standard domestic piping
Application: designed for radiator and heating circuit balancing
Operational effect: maintains stable differential pressure and reduces flow variations
Construction: mechanical valve body suitable for hot water heating systems
How to use
Install the FERRO ZR3 in the return or supply main as recommended by hydraulic design, ensuring correct flow direction and secure threaded connections. Adjust system commissioning to account for the valve’s preset or adjustable differential pressure characteristic so that radiators and circuits receive the intended flow. Routine inspection during seasonal maintenance should verify that connections are leak-free and that the valve operates without obstruction from debris.
Usage recommendations
For reliable performance, fit appropriate strainers or filters upstream to prevent particulate ingress. During commissioning, coordinate the valve setting with pump speed and radiator thermostatic valves to achieve balanced flow. Use the valve in systems with compatible water quality and temperatures within standard central heating ranges.

## FAQ

### How much does the FERRO ZR3 differential pressure valve 6/4" cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 09.07.2026 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/11835990/67235701_large.webp