# Differential valve for central heating FERRO ZR2 5/4" for CO systems

**URL:** https://aio.lv/en/product--ferro-zr2--11835974
**Data updated:** 2026-03-09 14:49 (EET)
**Category:** Heating Radiators
**Manufacturer:** FERRO
**Manufacturer code:** ZR2
**EAN:** 5901095641299
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 15.69 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-zr2--11835974

## 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 ZR2 differential valve for central heating (CO) with 5/4" connection. Designed to balance pressure differences and stabilize flow in heating circuits, the valve helps prevent hydraulic disturbances and supports proper operation of radiators and boilers. Suitable for residential and light-commercial heating systems where pressure regulation and flow stabilization are required.

## Long description

FERRO ZR2 differential valve for central heating with a 5/4" connection is designed to balance pressure differences and stabilise flow in closed CO heating circuits. The valve reduces hydraulic disturbances caused by simultaneous pump operation or zone control, helping maintain steady flow through radiators, underfloor heating manifolds, and boilers. Constructed for residential and light-commercial systems, the device is intended for use where reliable differential pressure control is needed to secure efficient heat distribution.
Advantages
The differential valve provides smooth pressure equalisation across heating branches, which minimises unwanted flow noise and prevents thermal imbalance between radiators. Its robust construction and compatible 5/4" connection make it simple to integrate into existing piping layouts. By reducing the risk of hydraulic interference, the valve supports consistent boiler operation and can improve system stability over a wide range of flow conditions.
Suitable for
Residential central heating systems with multiple heating circuits
Light-commercial buildings requiring stable pressure control
Systems with radiator groups, underfloor heating manifolds, or thermostatic valve clusters
Installations where pump staging or zone valves cause pressure fluctuations
Key specifications
Connection size: 5/4" (threaded)
Function: differential pressure regulation for central heating circuits
Application: closed water-based heating systems (CO)
Material: corrosion-resistant valve body suitable for heating media
Installation orientation: inline with primary/secondary circuit piping
How to use
Install the differential valve in the return or supply line where pressure variations occur, following local plumbing codes and the system design. Ensure appropriate shut-off valves and strainers are fitted to allow maintenance. Commission the system by gradually increasing pump speed or opening zone valves while observing flow and pressure; the valve will self-regulate differential pressure within its operational range. Regular inspections during scheduled maintenance help confirm correct operation and detect debris or signs of wear.
Usage recommendations
For optimal performance, fit the valve together with isolation and flushing fittings to allow system cleaning before commissioning. Use compatible pipe materials and ensure correct thread sealing. When integrating with pump controls or multiple zones, verify settings on pump staging devices to avoid exceeding the valve’s intended differential pressure range.

## FAQ

### How much does the FERRO ZR2 differential valve 5/4" for central heating cost, and is it available for purchase?

The price is 18.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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/11835974/67235685_large.webp