# Circulation pump WILO Yonos Maxo 40/0.5-4 (model 2120645) — high-efficiency heating pump, flange DN 40

**URL:** https://aio.lv/en/product--wilo-2120645--11953956
**Data updated:** 2026-03-11 13:51 (EET)
**Category:** Water Pumps
**Manufacturer:** WILO
**Manufacturer code:** 2120645
**EAN:** 4048482235929
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 694.49 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 573.96 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--wilo-2120645--11953956

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

WILO Yonos Maxo 40/0.5-4 circulation pump (model 2120645) is a flange-mounted pump for heating and circulation systems. It offers variable differential pressure control and compact installation dimensions for DN 40 connections. Intended for central heating, hot water recirculation and boosting in residential or light-commercial installations, it provides reliable flow control and energy-efficient operation.

## Long description

The WILO Yonos Maxo 40/0.5-4 is a flange-mounted circulation pump designed for heating and hot water recirculation systems with DN 40 connections. Built for variable differential pressure control, this high-efficiency heating pump offers compact installation dimensions while maintaining reliable flow control for central heating, domestic hot water circulation and light commercial boosting applications. The design emphasizes energy-efficient operation and stable hydraulic performance across the working range.
Advantages
The pump features variable differential pressure control that adapts to changing system demands, reducing energy consumption compared with fixed-speed pumps. Its flange DN 40 connection and compact footprint simplify integration into existing piping layouts and mechanical rooms. The motor and hydraulics are optimised for quiet operation and long service life, and the unit provides consistent flow rates and pressure stability under varying loads.
Suitable for
 Central heating systems in residential and light-commercial buildings
 Domestic hot water recirculation and balancing
 Boiler and heat pump integration where DN 40 flange connections are required
 Circulation and boosting duties in small commercial plant rooms
Key specifications
 Connection type: flange for DN 40 piping
 Control: variable differential pressure regulation
 Application: heating and hot water circulation, boosting
 Design: flange-mounted inline circulation pump with compact dimensions
 Performance focus: energy-efficient operation and stable hydraulic control
How to use
Install the pump in the return or supply line following standard hydraulic practice and the system designer’s instructions. Ensure correct flange alignment and gasket seating, and use appropriate bolts and torque to achieve a leak-free connection. Connect the electrical supply according to local regulations and select the differential pressure setting that matches the system curve. Commission the pump by purging air from the circuit, verifying flow direction, and checking for vibration or unusual noise. Adjust control settings during initial operation to optimise flow and minimise power consumption.
Usage recommendations
For reliable performance, use water treatment appropriate for closed heating systems and follow routine maintenance intervals: inspect flanges and seals, verify electrical connections, and check pump bearings and impeller condition. When replacing an existing unit, confirm flange dimensions and hydraulic requirements to ensure compatibility. Consult manufacturer documentation or a qualified HVAC technician for system-specific configuration and troubleshooting.

## FAQ

### How much does the WILO Yonos Maxo 40/0.5-4 circulation pump cost, and is it available for purchase?

The price is 694.49 € (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 16.07.2026 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, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can WILO Yonos Maxo 40/0.5-4 circulation pump be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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 WILO 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 WILO 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/11953956/67398172_large.webp