# Boiler with Oven Klass KALVIS-4B-1, model K4B1

**URL:** https://aio.lv/en/product--klass-k4b1--12396890
**Data updated:** 2026-04-27 22:28 (EEST)
**Category:** Fireplaces & Stoves
**Manufacturer:** Klass
**Manufacturer code:** K4B1
**EAN:** 4779026490442
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 1 097.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 907.43 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--klass-k4b1--12396890

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Boiler with oven Klass KALVIS-4B-1 (K4B1) combines a solid-fuel boiler and integrated oven into a single heating appliance. Designed for space heating and cooking or baking, it provides combined functionality for homes or cabins where both heat generation and a cooking surface are required. Suitable for installations that require a multi-purpose heating solution.

## Long description

The Klass KALVIS-4B-1 (K4B1) is a combined solid-fuel boiler with an integrated oven, designed to provide space heating and a cooking surface in one compact unit. It is intended for use in homes, cabins or outbuildings where a single appliance is preferred for both heating and simple cooking or baking tasks. The design focuses on delivering stable heat output to radiators or a thermal mass while offering an oven chamber for baking or warming food.
Advantages
This boiler with oven offers combined functionality that reduces the need for separate heating and cooking appliances. Its solid-fuel combustion system enables operation without electricity, making it suitable for off-grid or frequently power-interrupted environments. The integrated oven provides a practical cooking option while the heating circuit transfers generated heat to the living space. Construction materials and layout are chosen to balance heat retention and efficient transfer to connected heating systems.
Suitable for
Heating small to medium-sized homes, cabins or workshops using solid fuel
Cooking, baking or warming food when a conventional kitchen appliance is not available
Off-grid or rural locations where electrical supply is unreliable
Situations requiring a multi-function appliance to save space
When it may not be suitable
The boiler with oven is not intended for high-capacity commercial heating or large multi-zone buildings where a dedicated, high-output boiler would be required. It may not meet performance expectations if the installation lacks appropriate flue, chimney, or a correctly sized heating circuit. Routine maintenance and manual fuel loading are required, so it may not be suitable for users seeking fully automated, low-attention heating systems.
Key specifications
Fuel type: solid fuel (logs, coal, or suitable biomass as recommended by the manufacturer)
Combined functions: space heating and integrated oven chamber for cooking/baking
Heat output: suitable for small to medium living spaces (refer to installer for exact sizing)
Operation mode: manual fuel feeding and combustion control via air inlets/dampers
Installation: floor-mounted unit requiring chimney/flue connection and hydraulic integration with the heating system
How to use
Install the Klass KALVIS-4B-1 according to local building codes and the manufacturer’s installation instructions, ensuring a correct chimney or flue connection and appropriate clearance to combustible materials. Load recommended solid fuel into the combustion chamber and ignite following safe procedures. Adjust primary and secondary air controls to regulate combustion rate and heat output. Use the integrated oven chamber for baking or warming food once the appliance has reached stable operating temperature. Regularly remove ash and inspect seals, door gaskets and flue passages to maintain safe and efficient operation.
What to consider before purchase
Confirm that the unit’s heating capacity matches the size and heat loss of the space to be heated with a qualified installer
Verify compatibility with your existing chimney or plan for appropriate flue installation
Consider local regulations on solid-fuel appliances and any required permits
Plan for regular maintenance, fuel storage, and safe ash disposal
Usage recommendations
For reliable performance, use dry, properly seasoned fuel with caloric value suited to the appliance, maintain clear flue passages, and schedule periodic inspections of the chimney and combustion chamber. Consult a qualified technician for sizing, setup, and safety checks before the first use.

## FAQ

### How much does the Boiler with Oven Klass KALVIS-4B-1 cost, and is it available for purchase?

The price is 1,097.99 € (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 06.07.2026 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, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can Boiler with Oven Klass KALVIS-4B-1 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 Klass 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 Klass 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/12396890/68680503_large.webp