# Thermostatic actuator Honeywell MT4-230-NO non-powered open, 230 V, normally open

**URL:** https://aio.lv/en/product--honeywell-mt4-230-no--1482416
**Data updated:** 2026-01-13 15:39 (EET)
**Category:** Other goods
**Manufacturer:** Honeywell
**Manufacturer code:** MT4-230-NO
**EAN:** 4019837107291
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 42.49 €
**Prices and availability valid until:** 2026-08-23 23:59
**Price without VAT (21%):** 35.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--honeywell-mt4-230-no--1482416

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 21.08.2026 | free |
| Pickup points | 26.08.2026 | 1.79 EUR |
| Courier delivery to door | 26.08.2026 | 4.99 EUR |

## Summary description

Honeywell MT4-230-NO is a thermostatic actuator designed for valve control in heating and HVAC systems. This non-powered, normally open actuator operates with a 230 V connection and provides reliable on/off control of zone valves and radiator valves. Suitable for retrofit or new installations where a normally open fail-safe position is required, it simplifies temperature regulation and system maintenance.

## Long description

Honeywell MT4-230-NO is a thermostatic actuator for valve control in heating and HVAC systems. This model is a non-powered, normally open actuator designed to control zone valves and radiator valves with a 230 V supply. It provides simple on/off operation and a fail-safe open position when power is removed, suitable for both retrofit and new installations where an open default state is required.
Advantages
The actuator offers a straightforward design that integrates with standard valve bodies and provides reliable mechanical switching without continuous power consumption. Its normally open configuration ensures valves revert to an open position in the event of power loss, supporting heat distribution and preventing cold spots. The device is compatible with common heating system wiring practices and is easy to mount and replace during maintenance.
Suitable for
Control of zone valves in residential and commercial heating systems
Actuation of radiator valves where a normally open fail-safe is required
Retrofit upgrades in existing HVAC installations
Applications that require simple on/off valve control at 230 V
Key specifications
Operating mode: normally open (fail-safe open on power loss)
Power supply: 230 V AC
Actuation type: non-powered holding position—mechanical switching driven by applied voltage
Intended use: thermal valve actuation for heating and HVAC systems
Mounting: direct fit to compatible valve bodies and flanges
Environmental rating: suitable for typical indoor heating system environments
How to use
Install the actuator onto a compatible valve following the valve manufacturer's mounting instructions. Connect the 230 V supply according to local electrical codes, ensuring correct wiring for normally open actuation. After installation, verify that the valve opens when power is removed and closes when the actuator is powered, performing functional checks at system start-up. Regular inspection during routine heating system maintenance helps confirm continued correct operation.
Usage recommendations
Use the actuator within the specified environmental and electrical conditions of the heating system. Ensure secure mechanical mounting and proper electrical isolation during installation. For replacement or retrofit, confirm physical compatibility with the existing valve body and follow local safety standards for mains-voltage connections.

## FAQ

### How much does the Thermostatic actuator Honeywell MT4-230-NO cost, and is it available for purchase?

The price is 42.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 173 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 21.08.2026 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. 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 Honeywell 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 Honeywell 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

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