# Expansion vessel Comap Solarix 35/2.5 (10 bar) for solar and heating systems

**URL:** https://aio.lv/en/product--comap-25824--12377134
**Data updated:** 2026-04-26 20:49 (EEST)
**Category:** Other goods
**Manufacturer:** Comap
**Manufacturer code:** 25824
**EAN:** 8712874258242
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 97.49 €
**Prices and availability valid until:** 2026-11-08 23:59
**Price without VAT (21%):** 80.57 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--comap-25824--12377134

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.10.2026 | free |
| Pickup points | 28.10.2026 | 1.99 EUR |
| Courier delivery to door | 28.10.2026 | 4.99 EUR |

## Summary description

Comap Solarix 35/2.5 expansion vessel, rated to 10 bar, designed for closed solar and heating systems. The diaphragm-type vessel provides hydraulic compensation for pressure fluctuations, protects system components from overpressure and reduces water loss. Suitable for domestic and small commercial solar thermal circuits and heating installations requiring a 35 L nominal volume and 2.5 bar pre-charge characteristic.

## Long description

The Comap Solarix 35/2.5 (10 bar) expansion vessel is a diaphragm-type pressure vessel designed for closed solar and heating systems. With a nominal volume of 35 liters and a factory pre-charge around 2.5 bar, it provides hydraulic compensation for thermal expansion, stabilises operating pressure and reduces the risk of water loss or frequent topping-up. Rated for system pressures up to 10 bar, this vessel is intended for domestic and small commercial solar thermal circuits and heating installations that require a medium-capacity accumulator to protect pumps, valves and heat exchangers.
Advantages
The diaphragm design separates the system fluid from the gas cushion, which preserves the vessel’s responsiveness over repeated expansion cycles and limits gas diffusion. A 10 bar maximum working pressure allows use in higher-pressure circuits while the 35 L nominal volume offers a balance between compact size and storage capacity. The pre-charge value near 2.5 bar is suitable for typical domestic solar and heating installations, helping maintain stable pressure and reducing stress on system components.
Suitable for
Domestic solar thermal systems and hot-water circuits
Small commercial heating installations and closed-loop hydronic systems
Systems requiring a 35 L expansion capacity with a nominal 2.5 bar pre-charge
Installations where a diaphragm vessel is preferred to separate fluid and gas
When it may not be suitable
This expansion vessel is not intended for open systems or applications requiring working pressures above 10 bar. It may be unsuitable for large commercial or industrial systems where a significantly greater expansion capacity or different pre-charge pressure is required. Always verify compatibility with system design parameters such as maximum allowable pressure and required expansion volume.
Key specifications
Nominal volume: 35 L
Pre-charge characteristic: approximately 2.5 bar
Maximum allowable working pressure: 10 bar
Diaphragm (membrane) type separating fluid and gas
Intended for closed solar thermal and heating circuits
How to use
Install the expansion vessel in accordance with system layout and manufacturer guidance, typically on the return line near the boiler or solar circuit manifold where hydraulic compensation is needed. Verify and adjust the pre-charge pressure of the vessel when the system is depressurised and empty, using a suitable pressure gauge and pump to match the static fill pressure of the heating or solar circuit. Secure mounting and correct orientation ensure reliable performance; connect using appropriate fittings and include isolating valves or a shut-off arrangement to allow service and replacement without draining the entire system.
What to consider before purchase
Confirm system maximum working pressure does not exceed 10 bar
Check that a 35 L nominal expansion volume meets calculated thermal expansion requirements
Ensure the 2.5 bar pre-charge is compatible with system static pressure or can be adjusted as needed
Verify available space and mounting options for a 35 L vessel
Usage recommendations
Check the vessel pre-charge periodically (for example, at annual maintenance) and inspect for signs of diaphragm failure or corrosion. When replacing or servicing, isolate the vessel and relieve system pressure before disconnecting. For best long-term performance, match vessel pre-charge to the system’s cold fill pressure and consider professional commissioning to confirm correct sizing and installation.

## FAQ

### How much does the Comap Solarix 35/2.5 expansion vessel (10 bar) cost, and is it available for purchase?

The price is 97.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 23.10.2026 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. All transactions are 100% secure and encrypted.

### Can Comap Solarix 35/2.5 expansion vessel (10 bar) 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 Comap 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 Comap 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/12377134/69807951_large.webp