# Differential valve for central heating FERRO ZR4 2"

**URL:** https://aio.lv/en/product--ferro-zr4--11836436
**Data updated:** 2026-03-09 14:50 (EET)
**Category:** Heating Radiators
**Manufacturer:** FERRO
**Manufacturer code:** ZR4
**EAN:** 5901095645549
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 30.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 25.20 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-zr4--11836436

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

FERRO ZR4 differential valve for central heating systems, sized 2" (2-inch) connection. Designed to maintain pressure or flow differential in heating circuits and protect system components by balancing hydraulic conditions. Suitable for use in domestic and small commercial boiler and radiator installations where differential pressure control and hydraulic separation are required.

## Long description

FERRO ZR4 differential valve, 2" connection, is designed for central heating systems to maintain a stable pressure or flow differential between primary and secondary circuits. The valve supports hydraulic balancing and protects pumps, boilers and other system components by preventing uncontrolled pressure variations. It is suitable for domestic and light commercial installations where differential pressure control or hydraulic separation is required.
Advantages
The differential valve provides reliable control of pressure or flow differences, reducing the risk of noise, cavitation and premature wear of circulating pumps. Its robust construction ensures consistent performance in typical heating system conditions. Installation with a 2" connection simplifies integration into existing pipework and helps maintain stable operation of radiators, boilers and heat exchangers.
Suitable for
 Residential central heating systems with separate primary and secondary circuits
 Small commercial boiler rooms and hydronic installations
 Systems requiring hydraulic separation or differential pressure control to protect pumps and valves
 Retrofit projects where a 2" connection size matches existing piping
Key specifications
 Connection size: 2-inch threaded connections suitable for standard heating pipes
 Function: maintains preset pressure or flow differential between circuits
 Application: designed for central heating and hydronic systems
 Material and construction: corrosion-resistant components intended for heating system media (water/glycol mixes where compatible)
 Operating temperature: suitable for typical boiler and radiator system temperatures
How to use
Install the differential valve in the pipework between the supply (primary) and the heating distribution (secondary) circuits according to the system design and flow direction. Ensure correct orientation and tighten connections to recommended torque values for a leak-free joint. After installation, purge air from the system and set the differential pressure or flow as required by the hydraulic design. Monitor the system during initial operation and adjust settings if necessary to achieve stable pressure balance and correct pump operation.
Usage recommendations
Use the valve with fluids compatible with heating systems (treated water or approved glycol mixtures), and follow manufacturer guidelines for maximum temperature and pressure. Periodically inspect for leaks and proper operation; service or replace when wear or performance loss is detected. For system-specific settings and integration, consult a heating professional or installer to ensure correct differential settings and optimal system performance.

## FAQ

### How much does the Differential valve FERRO ZR4 2" cost, and is it available for purchase?

The price is 30.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 7 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 07.07.2026 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/11836436/67236085_large.webp