Eco Happy (Solar Expert)

Published February 23, 2024

Biasi boilers are a great choice when it comes to an efficient supply of hot water on demand because they are easy to install and maintain, affordable, and known for their efficiency. They are a good choice to provide hot water and heating in your home, which will keep you and your home warm through the icy winters.

So, if it is time to replace your old boiler with a hot new model, then it’s a good idea to compare which Biasi boiler models will best suit you and your household’s requirements. We will compare the main boilers and delve into their features, pricing, and benefits so you can make the best decision for your heating system.

About Biasi: A Leading Boiler Manufacturer

Biasi boilers are turning up the heat in the UK. In the 1930s, Leopold Biasi started a small company aimed at household central heating. In the 1940s, they started making domestic boilers, and in 1986, they produced their first gas boiler. Today, they are a go-to heating solution provider.

From humble beginnings in the 1930s, in a small workshop in Poredenone, Italy, Biasi boilers quickly gained worldwide popularity. In 1990, Biasi UK Ltd. was formed to start spreading heat in Britain. Biasi UK Ltd. now operates from a massive 5,946 sq m facility located in Walsall, producing boilers to warm up homes across the UK.

Exploring Biasi Boiler Prices

Pricing for a Biasi boiler will differ mostly based on the type, size and output of the boiler you require for your household needs.

Let’s take a closer look at the Advance Plus 7 combi boiler for its cost-efficiency and the respective Advance OV and Plus 7 regular and system boilers for their combined heating output.

Advance Plus 7 combi gas boilers

  • Outputs: 25 kW, 30 kW, 35 kW
  • Cost:
    • 25 kW – around £650
    • 30 kW – around £675
    • 35 kW – around £750
  • Features:
    • Digital display to easily adjust settings
    • Built-in frost protection
    • Electronic ignition
  • Size (H-W-D): 710 x 400 x 290 mm
  • Weight: 34.5 kg
  • Warranty: 7-year warranty
  • Suitability:
    • 25 kW: best for small households (1 or 2 people)
    • 30 kW: best for medium-sized households (3 people)
    • 35 kW: best for larger households or small households with extra guests (up to 5 people)


Biasi Advance Plus 7 Biasi Combi Boilers, unlike the regular and system boilers, give you the best of both worlds. You get a high-efficiency water heater and a central heating system all in one. This combi boiler works well for smaller households, especially if you need less hot water.

A great benefit of combi boilers is that you won’t need a separate hot water and cold water storage tank. This range of Biasi combi boilers provides domestic hot water as you need it because the water is heated as it runs through the boiler. You save space as there is no need for a storage tank, and you save money as you only need to pay for one installation.

There are three power outputs to choose from with the Biasi Advance Plus 7 Combi Boilers, depending on which is most suitable for your home. You can effortlessly control the temperatures with the digital display. In addition to ensuring you have a consistent supply of heat, you will also have instant hot water, so you can defrost in the shower.

Advance OV regular gas boilers

  • Outputs: 15 kW, 18 kW, 24 kW
  • Cost:
    • 15 kW – around £625
    • 18 kW – around £600
    • 24 kW – around £625
  • Features:
    • Built-in weather compensation, which works with a temperature probe
    • Single-coil heat exchanger for free-flow water
    • Energy-efficient, which can help reduce your utility bills
    • Compact yet powerful
    • Requires a separate water tank to store water
  • Size (H-W-D): 710 x 400 x 290 mm
  • Weight: 33.5 kg
  • Warranty: 5-year guarantee
  • Suitability:
    • 15 kW – suitable for small flats or bungalows
    • 18 kW – suitable for a small family or a two-bedroom flat
    • 24 kW – suitable for a three- to four-bedroom home


The Biasi Advance OV Regular Gas Boiler heats things up when it comes to the competition. It has a great advantage with its weather compensation system. By simply adding a temperature probe, the boiler can intuitively adjust the water temperature based on external temperatures. This means that it will increase the heat only when needed, which helps save you money.

If you live in a small space, the Biasi’s regular boiler range has a compact design compared to other regular boilers and can be neatly wall-mounted to save space.

When you compare Biasi regular boilers with other boilers, you will find that the prices are reasonable, and the energy-saving aspect makes it an even more attractive choice.

Advance Plus 7 system gas boilers

  • Outputs: 25 kW, 30 kW
  • Cost:
    • 25 kW – around £650
    • 30 kW – around £675
  • Features:
    • It needs a separate external hot water container, which makes it ideal for larger homes
    • It has a heat modulator, so it can regulate the water temperatures
    • Pre-heats the water, reducing time spent waiting for hot water
    • Built-in frost protection
  • Size (H-W-D): 710 x 400 x 290 mm
  • Weight: 33.5 kg
  • Warranty: 7-year warranty
  • Suitability: Best for medium- to large-sized homes or where there is a greater need for hot water.


Just like the Biasi regular gas boiler range, the Biasi System boilers also use a separate water tank. This means that you get a constant supply of hot water to keep the whole family happy. This system boiler range is great for families that take lots of showers or long, relaxing baths. The extra water container also keeps the water hotter for longer.

The Biasi Advance Plus System Boiler Range also makes heating your home easier. So if you need to replace your existing boiler, then this boiler range may be the answer.

Understanding Biasi Boiler Warranty

The Biasi boiler warranty usually lasts for 5 or 7 years (product-based) if a mechanical or electrical fault was caused during production.

Let’s look at the basic conditions of these warranties.

  • The installation needs to happen within 60 days of the purchase.
  • The boiler installation must be completed by a registered Gas Safe installer.
  • The installer must complete the Benchmark booklet as well.
  • You have 30 days from installation to register your new boiler with both Biasi and the Gas Safe Register.

It is also important to have your Biasi boiler serviced annually to maintain the warranty. Just remember to keep records of all your service receipts, as this is important for your warranty to remain valid.

When it comes to customer service, Biasi offers great domestic installations, where boilers are installed for water heating purposes. Their customer service department is open during the week, excluding bank holidays.

Common Biasi Boiler Problems and Solutions


Error message: ER 04

A low-pressure boiler can cause an issue in a house full of people when everyone wants hot water for a shower.

Solution: Start by checking for error codes on the display, and then check your user manual. Check the pressure gauge and the water pressure. If the problem persists, you may need to call in a professional, but the likelihood is that you need a higher-powered boiler.

Strange noises

Error message: No error code

If the boiler sounds like it has a ghost rattling about inside, there could be an internal issue, or it could simply be some air trapped in the boiler.

Solution: Check the water pressure. If the pressure is low, this can cause weird noises. Another solution is to bleed the radiators. Make sure the boiler is turned off and the radiator is cold before you try this solution. If all else fails, call in a professional.

The boiler won’t ignite

Error message: ER 01

If the boiler doesn’t ignite, you likely won’t have any hot water supply.

Solution: First, check the gas supply. Is the gas on? Try a simple reset. Sometimes, simply restarting does help. If it doesn’t, then check for any loose wires or burned-out parts. If something looks awry, then rather get someone to come find the problem.

Error Codes

These are some other common error codes:

  • ER 03 + RESET: This is a general lockout. You need to reset your boiler.
  • ER 05: You have a faulty fan control system, which will need to be repaired or replaced.
  • Two hyphens (- -): The boiler is in standby mode.

Important tips to remember

  • Regularly check your boiler and have the boiler serviced annually.
  • Regularly bleed your radiators to remove trapped air.
  • Don’t set the temperature too high. This will only increase maintenance and utility costs.
  • Check the pumps and valves regularly to ensure they are working properly.


What is a combi boiler?

Combi boilers provide water heating and central heating in a single unit. They are an efficient and affordable heating solution. There is no additional water tank, as the water is heated as it flows through the system.

Is it better to get a combi boiler or a system boiler?

This is purely dependent on your specific requirements. Most combi boilers can cover an average household size of three people, but system boilers can accommodate larger families of around five people.

The Advance Plus 7 Combi Boilers are more suitable for couples. You just need to keep in mind how many rooms there are for the central heating and how much domestic hot water you require.

How much does it cost to install a Biasi boiler?

The cost of installing a boiler system can range from £500 to a few thousand pounds. Fortunately, Biasi boiler prices are generally not outrageous because they are less complicated to install than many other brands.


If you have a small household but need comprehensive water heating and a central heating boiler, then the Biasi Advance Plus 7 Combi Boiler is the perfect option for you. However, if you just need to keep the hot showers flowing in a larger home, look at the regular boiler or system boiler Biasi models.

Based on the size of your household, your budget, and your water and heating requirements, Biasi has a boiler that will keep your central heating on and the hot water flowing. Biasi boilers offer the perfect blend of warmth, efficiency, and affordability.

Contact Eco Happy for efficient and reliable heating solutions for your home. Eco Happy can advise you on the right boiler to suit your individual needs and lifestyle, so you never have to worry about taking a cold shower again!

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