Introduction: Your 2025 Boiler Guide Under ECO4
If you are wondering about how to get a new boiler under ECO 4 scheme? We’ve got your back. With this complete boiler guide, we will walk you through everything you need to know… From boiler types to how ECO4 funding works.
Let’s break it all down in simple terms for you to understand how boilers work, what are the available brands and any boiler-related malfunctions that might leave you in a bind… We got you! Whether you’re just starting out or already comparing options, this guide is your boiler buying companion.
Boiler Brand partners
Heatcore is an established brand in partnership with many accredited partners in the UK. A list of these brands is as follows.
- Vaillant
- Worcester Bosch
- Ideal
- Baxi
- Glow‑worm
- Potterton
- Pennine
- Tag Gas (Certified Installer Network)
- TrustMark (Government-Approved Quality Standard)
- Viessmann
Trusted Boiler Brands: Know Who’s Keeping You Warm
Now that you’ve got the basics nailed, let’s take a proper look at the big-name brands behind some of the UK’s most reliable boilers. These aren’t just logos, they’re backed by decades of engineering, customer care, and quality performance. We work with the best because you deserve the best.
Vaillant
Based in: Germany (but with a big UK presence)
Types: Combi, System, Regular
Why people love them:
Vaillant is one of Europe’s top heating manufacturers and pioneers of low-emission, energy-efficient boilers. Their combi boilers are especially loved for how quietly they run, ideal if your boiler’s in the kitchen or near bedrooms.
Popular models:
- ecoTEC Plus Combi – smart-ready, efficient, compact
- ecoTEC Exclusive – top-tier performance, great for larger homes
- ecoFIT Pure – small and lightweight for tight spaces
Viessmann
Based in: Germany
Types: Combi, System, Regular
Known for: High-efficiency condensing technology, sleek design, and durable engineering
Popular models:
- Vitodens 050-W
- Vitodens 100-W
- Vitodens 200-W
For more details, read our blog on Viessmann boilers.
Worcester Bosch
Made in: Worcester, UK 🇬🇧
Types: Combi, System, Regular
Why do they stand out?
The British classic. Award-winning for reliability, energy performance, and customer service. Worcester Bosch boilers come with generous guarantees and are known for having top-shelf aftercare.
Popular models:
- Greenstar 4000 Combi – sleek design, ultra-quiet
- Greenstar CDi Compact – ideal for flats or tight cupboards
- Greenstar Ri (Regular) – good for homes with traditional heating setups
Ideal Boilers
Made in: Hull, UK 🇬🇧
Types: Combi, System, Regular
Why we rate them:
They’re budget-friendly but still built to last. Ideal boilers combine affordability with British engineering, and many of their models come with 7–10-year warranties. A great ECO4 option.
Popular models:
- Logic+ Combi – compact, low noise, ErP A-rated
- Vogue Max – high-performance with premium build
- Logic System – great for mid-sized homes
Baxi
Based in: Preston, UK 🇬🇧
Types: Combi, System, Regular
What makes them great:
One of the oldest UK heating manufacturers is still going strong. Baxi’s boilers are known for being simple to use, robust, and a doddle to maintain. Ideal if you want minimal fuss.
Popular models:
- Baxi 800 Combi – compact with 10-year warranty
- Baxi EcoBlue Advance – quiet and efficient
- Baxi Megaflo System – excellent for homes with high hot water demand
Glow-worm
Part of: Vaillant Group
Made in: Derbyshire, UK 🇬🇧
Types: Combi, System
Why they’re trusted:
Affordable and backed by Vaillant’s manufacturing standards. Glow-worm offers simple, efficient heating options that are perfect for standard UK homes. A go-to brand under ECO4 installations.
Popular models:
- Energy Combi – easy install, great value
- Ultimate3 System – strong mid-range option
- Betacom4 Combi – cost-effective with decent power
Potterton
Owned by: Baxi Heating
Made in: UK
Types: Combi, System
Why do people go for them?
Potterton’s been around for over 150 years. Their boilers are straightforward, easy to install, and great for first-time buyers.
Popular models:
- Promax Combi – quiet and compact
- Titanium Combi – strong flow rates, smart compatible
- Gold Combi HE – reliable and ideal for standard households
Which Boiler Is Right for Me?
Choosing the right boiler comes down to your home’s size, heating demands, and energy efficiency goals. If you’ve got a small to mid-sized home, a combi boiler from Ideal or Vaillant might be spot on for instant hot water and lower bills. Larger homes with multiple bathrooms may benefit more from a system boiler like the Baxi Megaflo. If you’re off the gas grid or looking to go greener, Viessmann’s high-efficiency models or solar-compatible options are worth a look. Still unsure?
Heatcore’s experts can guide you through the best ECO4-approved option for your home.
Tag Gas
Certified installer network: UK-wide
What they do:
Not a boiler manufacturer, but an approved network of Gas Safe engineers. We work with Tag Gas to install and maintain your system, ensuring it’s up to UK regulations and safe as houses.
TrustMark – Your Assurance of Quality
Every installation done through Heatcore is backed by TrustMark, the Government-endorsed quality scheme. It ensures that work done in your home meets high standards and is carried out by professionals you can rely on.
| Brand | Made In | Boiler Types | Key Features | General Rating |
| Vaillant | Germany / UK | Combi, System, Regular | Quiet operation, premium efficiency, smart tech ready | ⭐️⭐️⭐️⭐️⭐️ |
| Worcester Bosch | Worcester, UK | Combi, System, Regular | Award-winning reliability, long warranties, sleek designs | ⭐️⭐️⭐️⭐️⭐️ |
| Ideal | Hull, UK | Combi, System, Regular | Great value, simple controls, long warranty options | ⭐️⭐️⭐️⭐️ |
| Baxi | Preston, UK | Combi, System, Regular | Robust builds, UK-made, easy to maintain | ⭐️⭐️⭐️⭐️ |
| Glow-worm | Derbyshire, UK | Combi, System | Budget-friendly, Vaillant-backed, easy install | ⭐️⭐️⭐️½ |
| Potterton | UK (Baxi Group) | Combi, System | Great for rentals, straightforward operation | ⭐️⭐️⭐️½ |
| Pennine | UK | Varies (Energy Solutions) | Custom heating setups, energy-efficient solutions | ⭐️⭐️⭐️ |
| Tag Gas | UK (Installer Group) | N/A (Installer Network) | Certified Gas Safe installer network, fast response | ⭐️⭐️⭐️⭐️ |
> Disclaimer: The ratings listed above are general industry comparisons sourced from trusted UK boiler guides and manufacturer spec sheets. All boilers offered through Heatcore’s ECO4 scheme are high-quality, energy-efficient models engineered using premium-grade components. Each one meets or exceeds government standards and is installed by accredited professionals to ensure long-lasting performance and safety. Your final boiler choice will be tailored to your home, heating needs, and ECO4 eligibility.
Boiler Types Explained
Let’s break it down to the basics. No complex series codes here, just the boiler types most suited for UK homes and ECO4 installs:
1. Combi Boilers (Combination Boilers)
Perfect for small to medium homes, combi boilers provide hot water and heating on demand — no need for tanks or cylinders. Ideal for energy savings and quick installation.
2. System Boilers
System boilers heat your central heating and store hot water in a separate cylinder. Great for homes with higher hot water demand.
3. Regular (Heat-Only) Boilers
Ideal for homes with traditional systems. They need both a hot water cylinder and a cold water tank, but they work well in large homes with multiple bathrooms.
4. Electric Boilers
A great alternative for homes not connected to the gas grid. Lower emissions, but typically higher energy bills.
5. Solar-Compatible Boilers
It can be integrated with solar thermal systems to reduce your reliance on gas or electricity.
6. Battery Storage Boilers
Store excess energy (often from solar) to be used later — a brilliant fit for eco-conscious homes looking to slash bills.
Don’t risk your home going cold, book a fast boiler check with Heatcore. [Apply now and stay warm before winter arrives]
4. Pricing context and ECO4 funding
Now we know about these beautiful brands and efficient boilers, the next question that would come to your mind is price. What is the price? The average UK boiler replacement costs around £1,600–£4,000. But HeatCore systems may be installed at no upfront cost if you qualify under the ECO4 scheme.
What’s ECO4?
It’s a UK Government initiative to help low-income households upgrade their heating systems. You can get a new boiler under ECO 4 if you:
- Receive qualifying benefits
- Have a home with a poor EPC rating (E, F, or G)
- The boiler is older than 10 years
- If you get any pension or universal credit
How to apply:
- Gather proof of income or benefits
- Check your EPC rating (get one here: [GOV.UK link])
- Apply through Heatcore’s online form
Act now before the funding pot runs out. [Check if you qualify for a free new boiler today]
Which Brands Fit Under ECO4?
Not all boilers cut ECO4, but don’t worry, we’ve got the good ones covered. Heatcore works with a range of trusted, ECO4-approved brands like Worcester Bosch, Ideal, Vaillant, Baxi, Glow-worm, Viessmann, and Potterton. These aren’t just big names, they’re known for energy efficiency, reliability, and great aftercare. So, if you qualify for the ECO4 scheme, you’ll be getting a solid upgrade, not a basic fix.
ECO4 vs Boiler Upgrade Scheme (Comparison)
The ECO4 scheme and the Boiler Upgrade Scheme both help UK households cut heating costs, but they work differently. ECO4 is designed for low-income homes and covers the full cost of a new boiler if you qualify. On the other hand, the Boiler Upgrade Scheme offers partial grants (around £5,000) mainly for heat pumps, not gas boilers, and you’ll usually need to pay the rest. If you’re on benefits or have a poor EPC rating, ECO4 is your better bet.
5. Common Boiler Issues and Quick Fixes
Boilers are invisible until they’re not. And trust me, when they stop playing nice, it’s usually at the worst possible time. But don’t panic. Here’s a simple breakdown of common issues, what might be causing them, and what you can do before calling in the cavalry.
- Problem: Cold radiators
Possible cause: Air trapped in the system
Fix: Grab your radiator key and bleed them. You’ll hear a hiss; that’s the air escaping. When water starts dripping, you’re done.
- Problem: Low boiler pressure
Possible cause: Leak or recent radiator bleeding
Fix: Check the pressure gauge (should be 1.0–1.5 bar). If it’s low, open the filling loop slightly to top it up. Don’t overdo it.
- Problem: No hot water
Possible cause: Thermostat, diverter valve, or even a frozen pipe
Fix: If your thermostat’s working and it’s not super cold outside, it’s time to call in a professional.
- Problem: Weird clanking or whistling sounds
Possible cause: Limescale build-up or trapped air
Fix: Could be a power flush job. Either way, don’t ignore it. Strange noises aren’t normal.
- Problem: The Pilot light keeps going out
Possible cause: Faulty thermocouple or gas issue
Fix: This one’s gas-related, so get an expert in. Better safe than sorry.
A lot of older boilers are just… past their prime. If your system’s over 10 years old and throwing tantrums weekly, the ECO 4 scheme might be your golden ticket to a brand-new boiler, no stress, no massive upfront cost.
6. Installation Process And What Happens When You Apply
So, you’ve applied through heatcore.co.uk and you qualify under ECO4… lovely stuff. What next?
Let’s walk you through what happens from click to cosy.
Step-by-step breakdown:
1. Online Application
You pop in your details using our easy boiler grant checker. It takes minutes.
2. Quick Call from Our Team
One of our friendly energy advisors will give you a ring to confirm your info and answer any questions you’ve got.
3. Home Survey (FREE)
We’ll schedule a visit at a time that suits you. Our surveyor checks your boiler, property size, insulation, and EPC rating.
4. Approval + Date Set
If you’re eligible, we get you approved quickly and book the installation. No back-and-forth, no chasing paperwork.
5. Boiler Installation Day
Our certified engineers fit your brand-new boiler (usually in a single day). We remove the old unit, tidy up, and test everything properly.
6. Aftercare + Support
We don’t disappear. Got questions after the install? You’ve got us on hand.
And the best bit? If you qualify under ECO4, there’s no upfront cost. You’ll be sitting with your feet up while the boiler works its magic.
7. Heatcore Innovation: More Than Just a Boiler
At Heatcore, we don’t just supply boilers. We build systems that push the limits of what home heating can do. Innovation’s baked into everything we do, and you’ll feel the difference every time you switch the heating on.
Here’s what makes us different from your average boiler installer:
Advanced Hydro-Cooling
Most systems just burn fuel and lose loads of heat in the process. Ours recycles heat, using hydro-cooling methods to maximise efficiency. That means lower bills, lower emissions, and a smarter use of energy.
Modular Boiler Designs
Not every home is the same, and neither are our boiler installs. Whether it’s a compact setup or a larger family home, we fit the boiler that works best for your space, heating needs, and energy rating. It’s never one-size-fits-all – it’s what’s right for your home.
Remote Diagnostics & Smart Monitoring
With certain models, you can monitor usage, efficiency, and spot faults early, all from your phone. It’s peace of mind, tech-style.
ECO4 Scheme Experts
We’ve helped thousands across the UK by upgrading their homes through government-backed schemes. We know what we’re doing. And we’re here to guide you every step of the way.
When you go with Heatcore, you’re getting more than a boiler. You’re investing in energy security, warmth, and proper British customer care.
Dorothy Wray 1 Review | GB
Oct 7, 2024
Fast, efficient, all done in one day
Fast, efficient, all done in one day. Great service
Date of experience: October 05, 2024
Reply from Heatcore
Oct 30, 2024
Thank you, Dorothy, for sharing your positive experience with us!
At Heatcore Energy Solutions, we’re committed to providing a 100% hassle-free service, helping homeowners access government-funded ECO grants to improve energy efficiency. We’re thrilled our team could deliver fast and efficient service to meet your expectations.
Thanks again for choosing us!Are you ready to beat the cold and get your free new boiler today?
8. Final Thoughts: Your Boiler Buying Journey, Wrapped Up
If your boiler’s giving you constant trouble, if you’re sick of high bills and chilly toes, or if you just want peace of mind before winter sets in, now is the time to act.
A new boiler under ECO 4 isn’t just an upgrade. It’s an opportunity to future-proof your home, protect your family from the cold, and cut your costs without spending a fortune upfront.
Let’s quickly recap your steps:
✅ Understand your boiler type and what fits your home
✅ Stay on top of maintenance to avoid common issues
✅ Know what ECO4 offers and whether you qualify
✅ Apply through Heatcore’s simple form
✅ Let our team handle the heavy lifting
✅ Enjoy a warmer, cheaper, and smarter home this winter
BOFU CTA (Last Chance Reminder):
Winter waits for no one. Don’t leave it till your boiler dies on a Sunday night in December. Apply now through Heatcore and get your new boiler sorted before winter is back.
