# Expansion vessel OTTONE OT090105 – closed hydronic expansion tank for heating systems, model OT090105

**URL:** https://aio.lv/en/product--ottone-ot090105--10792078
**Data updated:** 2026-04-24 17:40 (EEST)
**Category:** Heating Radiators
**Manufacturer:** OTTONE
**Manufacturer code:** OT090105
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 55.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 46.27 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ottone-ot090105--10792078

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 6.39 EUR |

## Summary description

OTTONE OT090105 expansion vessel is a closed hydronic expansion tank designed for heating and hot-water systems. The membrane-type vessel absorbs pressure fluctuations and protects piping and components from overpressure. Suitable for installation on sealed central heating circuits to stabilize system pressure and compensate for thermal volume changes.

## Long description

OTTONE OT090105 expansion vessel is a closed membrane hydronic expansion tank engineered for sealed heating and hot-water systems. The vessel accommodates thermal volume changes and absorbs pressure fluctuations to help maintain stable system pressure and reduce stress on pipes, valves and other components. Designed for installation on central heating circuits, this model is suitable for residential and light commercial systems where a compact, membrane-type expansion solution is required.
Advantages
The membrane design separates the fluid from the pre-charged gas chamber, ensuring consistent pressure compensation and minimizing the risk of corrosion. Its closed construction reduces the need for maintenance and prevents direct contact between the heating medium and the gas cushion. The unit’s compact dimensions make it suitable for confined installation spaces while providing effective volume compensation for typical small to medium heating circuits.
Suitable for
 Sealed central heating systems in residential buildings
 Small commercial heating circuits with closed-loop water systems
 Hot-water systems requiring pressure stabilization and thermal expansion compensation
 Installations where a compact membrane expansion vessel is needed
When it may not be suitable
This expansion vessel is intended for closed hydronic circuits and may not be appropriate for open systems, potable water service without compliance checks, or applications requiring very large expansion volumes. For large-scale commercial or industrial systems with high thermal capacity, a vessel with greater volume or a different configuration could be required.
Key specifications
 Type: closed membrane (diaphragm) expansion vessel
 Function: compensates thermal expansion and stabilizes pressure
 Connection orientation: standard threaded inlet suitable for common heating fittings
 Typical application: sealed central heating and hot-water circuits
 Construction: steel shell with internal flexible membrane and pre-charged gas chamber
 Installation: wall- or pipe-mounted near boiler or circulation line (depending on system layout)
How to use
Install the expansion vessel on the return line or a suitable location near the boiler or primary circulation loop, following local regulations and the heating system design. Ensure the vessel’s pre-charge pressure is set to match the static system pressure before commissioning. After connecting, slowly fill the system and vent air from high points. Monitor system pressure during the first heating cycle and adjust the pre-charge or system fill pressure as necessary to achieve stable operation. Periodic visual checks and pressure verification are recommended to confirm proper function.
What to consider before purchase
 Required expansion volume based on system water content and maximum temperature
 System static pressure and matching the vessel pre-charge pressure
 Connection size and compatibility with existing fittings and piping
 Available installation space and mounting orientation
 Operating temperature range and compatibility with the heating medium
Usage recommendations
Verify pre-charge pressure with a pressure gauge before installation, follow manufacturer or local plumbing codes for mounting and connections, and perform an initial commissioning check to ensure air is fully vented from the system. For systems with frequent pressure loss or repeated cycling, inspect the membrane periodically and consider professional service if irregularities occur.

## FAQ

### How much does the Expansion vessel OTTONE OT090105 cost, and is it available for purchase?

The price is 55.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 08.07.2026 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 OTTONE 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 OTTONE 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/10792078/60040757_large.webp