Smart boilers and smart heating controls promise lower bills and more convenient heating, but they come at a cost. This guide looks at what smart boilers actually offer, and whether the upgrade is worth it for your home.
What Counts as a “Smart Boiler”?
Strictly speaking, a smart boiler is one built with internet connectivity and app control included. More commonly, “smart boiler” refers to a standard boiler paired with a smart thermostat, such as those compatible with the OpenTherm communication standard, which allows finer control over heating output than a basic on/off thermostat.
Boiler Plus and Efficiency Standards
Under the UK government’s Boiler Plus standard, new combi boiler installations in England must include specific efficiency measures, such as smart heating controls with automation and optimisation features. This has pushed smart controls from a nice-to-have into a near-standard part of many new installations. Boiler efficiency itself is also rated under the ErP (Energy related Products) scheme, with A-rated boilers representing the most efficient models.
What Smart Controls Actually Do
- Learning and scheduling – some systems learn your routine and adjust heating times automatically
- Remote control via app – turn heating on or off, or adjust temperature, from outside the home
- Room-by-room control – when paired with smart thermostatic radiator valves (TRVs), heat only occupied rooms
- Weather compensation – some systems adjust flow temperature based on outdoor conditions, improving efficiency
Do Smart Boilers Actually Save Money?
Savings depend heavily on your existing habits. Households that previously left heating running constantly, or heated empty rooms unnecessarily, tend to see the biggest improvement. For those already heating efficiently, the savings may be more modest. Our guide to heating a house for cheap covers other low-cost ways to reduce bills alongside or instead of a smart upgrade.
Installation and Compatibility
Most smart thermostats can be retrofitted to an existing boiler by a Gas Safe registered engineer, without needing to replace the boiler itself. However, compatibility varies by boiler brand and age, so it’s worth checking this before buying a specific smart control.
Smart Controls vs. a New Boiler
If your existing boiler is reasonably efficient and well-maintained, adding smart controls is usually a cheaper first step than replacing the whole system. If you’re considering a full system change, our heat pump running costs guide covers a lower-carbon alternative worth comparing.
Frequently Asked Questions
Do I need a new boiler to use smart heating controls?
Not usually. Most smart thermostats can be fitted to an existing boiler, provided it’s compatible with the chosen system.
Is Boiler Plus a legal requirement?
Yes, for new combi boiler installations in England, Boiler Plus efficiency measures are a building regulations requirement.
How much do smart heating controls typically save?
Savings vary by household, but they’re generally greatest for homes that previously heated inefficiently or left the system running unnecessarily.
