# Inverter solar heater QOLTEC ECO Boost 3kW 4kW — inverter for solar heating, models 3 kW and 4 kW

**URL:** https://aio.lv/en/product--qoltec-53867--11419566
**Data updated:** 2026-02-14 19:47 (EET)
**Category:** Power Inverters
**Manufacturer:** QOLTEC
**Manufacturer code:** 53867
**EAN:** 5901878538679
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 294.49 €
**Prices and availability valid until:** 2026-08-22 23:59
**Price without VAT (21%):** 243.38 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--qoltec-53867--11419566

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.08.2026 | free |
| Pickup points | 06.08.2026 | 1.79 EUR |
| Courier delivery to door | 06.08.2026 | 4.99 EUR |

## Summary description

QOLTEC ECO Boost inverter solar heater available in 3 kW and 4 kW variants. Designed to convert DC from solar panels into AC for powering heating elements or circulation pumps in solar thermal systems. Suited for residential or small commercial solar heating setups, it supports reliable energy conversion, helps reduce grid consumption, and enables use of harvested solar power for water or space heating.

## Long description

The QOLTEC ECO Boost inverter solar heater is offered in 3 kW and 4 kW power variants and is intended to convert DC output from photovoltaic arrays into AC power usable by heating elements and circulation pumps in solar thermal systems. The device enables the direct use of generated solar energy for water or space heating, reducing grid consumption during sunlit hours. Compact and designed for integration with residential and small commercial installations, the inverter provides steady conversion and protection features needed for everyday operation.
Advantages
The QOLTEC ECO Boost inverter provides efficient DC-to-AC conversion tailored for heating loads with two nominal power options, allowing installers to match capacity to system size. Built to support heating elements and pump motors, it reduces dependence on mains electricity and allows higher self-consumption of solar production. The product emphasizes straightforward installation, reliable operation under variable solar input, and compatibility with existing solar thermal components without requiring major system changes.
Suitable for
Domestic solar water heating systems using electric heating elements
Small commercial solar thermal installations with pump-driven circulation
Retrofit projects that aim to increase on-site solar energy utilization
Systems seeking to minimize grid import during peak solar hours
Key specifications
Available output power: 3 kW or 4 kW
Function: converts photovoltaic DC into AC for resistive heaters and pumps
Input: photovoltaic DC voltage range suitable for standard panel arrays
Output: AC waveform compatible with heating elements and small motor loads
Protection features: built-in safeguards for overcurrent, overvoltage and thermal conditions
Form factor: compact housing for wall or equipment-room mounting
Operating environment: intended for residential and small commercial installations
How to use
Install the inverter in accordance with the system design, connecting the photovoltaic array DC input to the inverter input terminals and the heating element or circulation pump to the AC output. Ensure all electrical connections and protective devices comply with local wiring regulations. Configure the inverter where applicable to match the load characteristics and required control logic so that heating elements operate when solar generation is available. Periodic inspection of connections, cooling pathways and protective components supports continued reliable operation.
Usage recommendations
For optimal results, size the inverter according to the combined power of heating elements or pumps and verify that the photovoltaic array can supply sufficient DC power under typical conditions. Use proper overcurrent protection and a qualified electrician for installation. Regularly check for dust accumulation, secure ventilation, and any signs of overheating. If the installation includes battery storage or grid-interactive components, follow system integration guidelines to prevent undesirable backfeed or control conflicts.

## FAQ

### How much does the Inverter solar heater QOLTEC ECO Boost 3kW 4kW cost, and is it available for purchase?

The price is 294.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 81 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 03.08.2026 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, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Inverter solar heater QOLTEC ECO Boost 3kW 4kW 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 QOLTEC 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 QOLTEC 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/11419566/66062283_large.webp