Best Combi Boilers for Radiant Heat
Radiant heating, or underfloor heating, is becoming increasingly popular with homeowners across the country thanks to its increased efficiency and compatibility with most boilers.
Radiant heating, or underfloor heating, is becoming increasingly popular with homeowners across the country thanks to its increased efficiency and compatibility with most boilers.
In this guide, we’ll explore how radiant heating works and what the best combi boilers are for those looking to install radiant heating in their homes.
What is radiant heat from a boiler system?
Radiant heat from a boiler system is a heating method that uses a boiler to heat water that is then circulated through pipes to warm home’s floors, walls and ceilings. The heated surfaces then radiate warmth into the room through infrared radiation.
Radiant heating has a number of benefits, including increased efficiency, reduced electricity bills and even a reduction in allergen distribution.
What kind of boiler is used for radiant heat?
You don’t need a specific type of boiler for radiant heating. If you already have a heating system in place, such as a combi boiler, you should be able to install radiant heating without any issues.
A range of different boilers can be used for radiant heating, including:
What is the best source of heating for radiant heat?
Hydronic systems are one of the cheapest and best sources of heat for radiant heating. They work by using a boiler to pump hot water through tubing installed under the flooring.
Although they are the best system, they can be expensive to install and they may not be suitable for every home.
How big of a boiler do you need for radiant heat?
The size of the boiler required for radiant heating will differ depending on the size of your home, making it difficult to give a straightforward answer. However, generally speaking is to use 25–50 BTUs per square foot of radiant floor heating.
There a few factors that need to be considered, including:
Best combi boilers for radiant heat
Choosing the right boiler is essential for ensuring the efficiency and reliability in your home's heating. Listed below, we’ve named our top combi boiler makes and models for radiant heating.
Valiant ecoTec Plus
Valiant’s ecoTec Plus is highly praised for its A-rated energy efficiency and reduced carbon emissions. This model is highly energy efficient and is known for its quiet operation and user friendly controls, making them ideal for radiant heating.

Viessman Vitodens
Viessman Vitodens 100-W and 200-W models are regarded as the hallmark for high-efficiency and modern technology. These models are compact in design and feature stainless steel Inox-Radial heat exchangers for increased durability.

Alpha E-Tec Plus
Alpha’s E-Tec Plus range offers a great balance between affordability and quality. The compact size with high energy efficiency makes these boilers suitable for a range of homes.

Ideal Logic Plus
The Ideal Logic Plus range is extremely popular thanks to their reliability and value for money. These boilers are extremely energy efficient, feature user-friendly interfaces and are compact, making them ideal for smaller homes.

Worcester Bosch Greenstar i
The Greenstar range is known for its efficiency and robust build, making them ideal for radiant heating. These boilers feature innovative smart thermostat compatibility with user-friendly controls, making them a great choice for many homes.
