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header-product Inverter solar heater QOLTEC ECO Boost 3kW 4kW — inverter for solar heating, models 3 kW and 4 kW
294.49 €

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

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

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

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Short 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.
Available at price 294.49 €: 4 pcs.
Total available for order: 81 pcs.
Warranty: 2 Years
SKU: 11419566
Manufacturer: QOLTEC
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.79 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
03.08.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
06.08.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 3.14 kg)
Parcel couriers
Unisend LV / Venipak Pickup LV / Venipak Locker LV / Latvijas Pasts pakomāts / DPD Paku skapis / Omniva LV / Latvijas Pasts nodaļa
06.08.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.79 €
0 credit

pay in 3 equal parts

today

0 €

afterward

3 mth. х 98.16 €

overpayment

0 €

All payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment
36 months installment: from 8.18 euros per month
Together cheaper
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Product information

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.

Description

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Stock data
Warehouse Stock Delivery to the store Store Price
EU1 4 03.08.2026
294.49 € Best price
WH323 73 31.07.2026 Best delivery
301.49 €
WH356 4 06.08.2026
350.99 €
294.49 €
Stock: 4
Delivery Date: 03.08.2026
Warehouse: EU1
301.49 €
Stock: 73
Delivery Date: 31.07.2026 Best delivery
Warehouse: WH323
350.99 €
Stock: 4
Delivery Date: 06.08.2026
Warehouse: WH356

Customer reviews

Customer questions

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. We work with leading banks and leasing companies in Latvia, allowing you to make your purchase on convenient terms — with a minimal down payment and a repayment period from 3 to 36 months. You can apply for credit or installments for the Inverter solar heater QOLTEC ECO Boost 3kW 4kW online, and the application process is as simple as possible:
  • Select the product on the website and add it to your cart;
  • When placing your order, choose the payment method “Installments”;
  • Fill in the required details for the lending partner;
  • Receive a decision within a few minutes.
For more information about available payment options, interest-free installment terms, and credit conditions in Latvia, please visit the Payment page.

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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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Quality Since 2008 AiO.lv has been on the market for over 18 years and has earned trust — with more than 6000 genuine positive reviews on Google.