In 2026, with the UK government's ban on gas boilers in new-build properties firmly in place since 2025, homeowners are increasingly turning to electric alternatives for sustainable heating. Electric boilers are gaining traction due to their low-carbon footprint, especially when paired with renewable energy tariffs.
If you're looking for reliable, cost-effective options, Biasi's Pro-Electric range stands out. Many models are available for under £1000 (including VAT), making them an accessible choice for budget-conscious buyers. In this post, we'll explain the differences between electric system and combi boilers, highlight Biasi's quality features, guide you on selecting the right power output for your home or apartment, and explore why these boilers are ideal for small homes and flats in the UK. Let's dive in.
Understanding Electric System Boilers vs Combi Boilers: What's the Difference?
When choosing an electric boiler, the main decision is between a system boiler and a combi boiler. Both run on electricity, eliminating the need for gas and flues, but they serve different needs.
- Electric Combi Boilers: These all-in-one units provide both central heating and instant hot water on demand, without needing a separate hot water cylinder. They're compact and ideal for smaller properties like flats or apartments where space is at a premium. Biasi's combi models, such as the 12kW and 14kW versions, offer continuous hot water flow rates of up to 7 litres per minute, perfect for taps and showers. However, they're not recommended for filling baths quickly in larger homes.
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Electric System Boilers: Designed to work with an indirect hot water cylinder (vented or unvented), these boilers are suited for properties with higher hot water demands, such as houses with multiple bathrooms. They heat water stored in the cylinder, allowing for simultaneous use in different rooms. Biasi's system boilers can integrate with solar PV systems for even greater efficiency and use timers to leverage off-peak electricity rates.
In summary, choose a combi for simplicity and space-saving in small homes, or a system for robust hot water supply in larger setups. Both Biasi types are nearly 100% efficient, modulating power from 2kW to full capacity to save energy.
Why Choose Biasi Electric Boilers? Quality, Warranty, and Support
Biasi Pro-Electric boilers are built with high-quality components for durability and performance. From the exploded views in their manual, key parts include a side insertion water pump, double-layer heater brackets, and high-limit thermostats for safety. The boilers feature a stylish touchscreen control panel with digital display, allowing easy adjustments for heating and hot water temperatures (30°C-80°C for heating, 30°C-60°C for hot water). They also include anti-freeze protection, child lock, and 24-hour timing functions for convenience.
One standout feature is the 3-year warranty, subject to annual servicing by a registered electrician. This ensures low maintenance costs, as there are minimal moving parts—making the boilers almost silent (15 dB) and less prone to breakdowns. Biasi emphasises safety with no risk of gas leaks or carbon monoxide, and their boilers are pre-wired for straightforward installation.
For technical support, Biasi provides after-sales service through their main office (Tel. 01922 714600) and recommends annual checks to maintain efficiency.
If you're ready to buy, check out the Biasi Pro Electric System Boiler 12kW Single Phase or the Biasi Electric Combi Boiler 25kW 3-Phase at Aizo Quality Heating.
Selecting the Right Power Output for Your Home
Biasi offers models from 6kW to 25kW, tailored to different property sizes and needs. Here's a guide based on their suitability chart:
- 6kW-8kW (Single Phase): Best for small apartments or flats (up to 50m²). Suitable for radiators, taps, showers, and even baths with a cylinder. Ideal for 1-2 bedrooms in London, with low current draw (26-35A).
- 12kW-14kW (Single or Three Phase): For medium-sized homes (50-100m²). Handles radiators, taps, and showers effectively, but not recommended for baths without additional storage. Great for 2-3 bedroom apartments or terraced houses.
- 16kW-25kW (Three Phase): For larger homes (over 100m²) with multiple bathrooms. Supports baths, showers, and extensive radiator systems. Requires a three-phase supply, common in bigger properties.
To determine the right power, consider your home's heat loss (use BS EN 12831 standards) and hot water demand. For a typical London apartment, a 12kW model suffices, costing around £950.
How to Install a Biasi Electric Boiler: A Simple Guide
Biasi boilers are wall-mounted and measure just 380mm wide x 230mm deep x 630mm high, fitting easily in kitchens or utility rooms. Installation must be by a competent, skilled, and registered engineer (Part P certified for electrical work).
Steps from the manual:
- Location: Mount on a sturdy wall in an upright position with clearance for servicing.
- Electrical: Use specified cable sizes (e.g., 10mm² for 12kW) and a calibrated leakage protection switch. Connect live (L), neutral (N), and earth (E) correctly.
- Plumbing: Use 3/4" male connectors for heating, 1/2" for hot water (combi), and 15mm for PRV. Fit a magnetic filter on the return side.
- Commissioning: Flush the system, check pressures (0.5-2.5 bar), and issue an electrical certificate.
The process takes 1-3 days, with no flue needed—perfect for apartments.
Why Biasi Electric Boilers Are Perfect for London Apartments
In London, where space is tight and many buildings lack gas access or are listed, electric boilers shine. Biasi models require no flue, making them compliant with strict regulations. Their compact size and wall-mounting fit seamlessly into flats, and the silent operation (15 dB) avoids disturbing neighbours.
Advantages include:
- Carbon-Free Heating: Pair with renewable tariffs for net-zero emissions, aligning with London's ULEZ and green initiatives.
- Cost Savings: Modulating power reduces energy use; off-peak tariffs cut bills. Running costs average £1,700/year for a small flat, competitive with gas.
- Easy Retrofit: Use existing pipework and radiators, no major renovations needed.
- Safety: No gas risks, ideal for high-rise apartments.
For urban living, Biasi 14kW model is spot-on—buy the Biasi Pro-Electric 14kW Combi Boiler.
Final Thoughts: Go Electric with Biasi for a Greener Future
Biasi electric boilers offer affordability, reliability, and eco-friendliness, with models under £1000 making them accessible for UK homeowners. Whether you opt for a system or combi, their 3-year warranty, quality components, and technical support ensure peace of mind. For London apartments, they're a no-brainer—compact, safe, and future-proof.
Ready to upgrade? Explore the full range at Aizo Quality Heating's Biasi collection.
Stay warm and sustainable!