Best Smart Heating Controls for a House With a Back Boiler

A back boiler keeps a home warm and the hot water flowing, but its controls are often decades behind the rest of the house. The best smart heating controls for a house with a back boiler bring scheduling, remote access and room-level comfort to an older system without demanding a full heating overhaul. This roundup covers five thermostats at three price tiers, chosen for wired compatibility, simple DIY setup and everyday usability. The overview table below shows which pick fits which household, and each review spells out the trade-offs.

Overview of the Picks

Product	Key Spec	Best Use	Price Tier
Honeywell Home X2P Programmable Thermostat	5-2 Day Schedule, 1 Heat/1 Cool	Tight budgets and simple weekday routines	Budget
Honeywell Home RTH9585WF1004 Smart Color Thermostat	7 Day Programmable, Wi-Fi, Alexa Ready	Households wanting full weekly control and a colour touchscreen	Premium
Sensi Smart Thermostat ST55	Wi-Fi, DIY, Alexa, Energy Star	First-time smart buyers and rental-friendly installs	Mid-range
ecobee Smart Thermostat Enhanced	Works with Siri, Alexa, Google Assistant	Multi-assistant homes and remote room sensing	Premium
Honeywell Home X2S Smart Wi-Fi Thermostat	Conventional/Heat Pump Compatibility, Wi-Fi	Straightforward app control at a modest price	Mid-range

Honeywell Home X2P Programmable Thermostat

Type: Programmable thermostat
Compatibility: Single-stage, 1 heat/1 cool
Schedule: 5-2 day
Colour: White
Control: Button and display

Honeywell Home X2P Programmable Thermostat — Check the current price on Amazon

The X2P is a straightforward programmable thermostat for conventional single-stage systems, which is exactly what most back boiler setups present at the wall plate. It runs a 5-2 day schedule, so weekdays share one routine and the weekend gets its own. The white housing and simple button layout suit a hallway or living room where the controls are seen daily. Buyers who want a set-and-forget upgrade without apps or accounts will find it does the job.

Who it suits: This is the pick for a household on a tight budget that still wants proper timed heating rather than a dial. It earned its place as the lowest-cost route to scheduled warmth. Trade-off: There is no Wi-Fi here, so the schedule has to be set at the unit itself and cannot be adjusted from a phone.

Honeywell Home RTH9585WF1004 Smart Color Thermostat

Type: Wi-Fi smart thermostat
Schedule: 7 day programmable
Display: Colour touchscreen
Voice: Alexa ready
Certification: Energy Star
Colour: Grey

Honeywell Home RTH9585WF1004 Smart Color Thermostat — Check the current price on Amazon

The RTH9585WF1004 steps up to full seven-day programming, with a different schedule possible for every day of the week. The colour touchscreen is the standout feature at this price, making schedule edits far less fiddly than on a button unit. Wi-Fi and Alexa readiness mean the heating can be adjusted remotely, and the Energy Star listing signals efficient default behaviour. The grey finish is a little more contemporary than plain white.

Who it suits: Best for a busy household with irregular days, where a single weekday routine never quite fits. It earned its place for the day-by-day flexibility and the touchscreen interface. Trade-off: The touchscreen and connected features add complexity, so a buyer wanting a purely offline control may find it more than needed.

Sensi Smart Thermostat ST55

Type: Wi-Fi smart thermostat
Installation: DIY
Voice: Alexa
Certification: Energy Star
Schedule: Programmable

Sensi Smart Thermostat ST55 — Check the current price on Amazon

The Sensi ST55 is built around DIY installation, which matters for older homes where calling out an engineer adds cost and delay. It connects over Wi-Fi, works with Alexa and carries Energy Star certification. The design is deliberately plain, with a simple display and a clean face that blends into a hallway wall. Scheduling runs from the app, so routines can be set without crowding around the unit.

Who it suits: A strong fit for first-time smart thermostat buyers and for anyone who wants app control without a premium price. It earned its place as the value entry into connected heating. Trade-off: The feature set is modest next to premium models, so buyers wanting room sensors or advanced learning should look higher up the range.

ecobee Smart Thermostat Enhanced

Type: Wi-Fi programmable smart thermostat
Voice: Works with Siri, Alexa and Google Assistant
Certification: Energy Star
Schedule: Programmable
Feature: Energy saving

ecobee Smart Thermostat Enhanced — Check the current price on Amazon

The ecobee Enhanced is the most connected thermostat in this group, working with all three major voice assistants rather than just one. Energy Star certification and energy-saving features are front and centre, aimed at trimming running costs over time. The touchscreen interface is polished and the app is built for remote scheduling and adjustment. It suits a household already invested in a smart home ecosystem.

Who it suits: Best for homes mixing Apple, Amazon and Google devices, where assistant flexibility matters. It earned its place as the premium, feature-rich option. Trade-off: It is the priciest pick here, and the advanced features only pay off if the household actually uses them.

Honeywell Home X2S Smart Wi-Fi Thermostat

Type: Wi-Fi smart thermostat
Compatibility: Conventional and heat pump
Colour: White
Control: App and unit

Honeywell Home X2S Smart Wi-Fi Thermostat — Check the current price on Amazon

The X2S sits between the budget X2P and the colour-screen Honeywell, offering Wi-Fi control in a plain white package. Its compatibility covers conventional systems and heat pumps, giving it headroom if the heating setup changes later. Setup and scheduling run through the app, and the on-unit controls stay simple. It reads as a sensible middle ground for buyers who want connectivity without a touchscreen.

Who it suits: Ideal for a household that wants app-based control and future-proof compatibility at a modest price. It earned its place as the practical all-rounder. Trade-off: The display is basic compared with the colour-screen model, so schedule changes are easier in the app than at the wall.

Before You Buy

• Compatibility: Confirm the back boiler’s zone valve and wiring match a conventional single-stage system before ordering.
• Wiring: Most back boiler setups use low-voltage thermostat wiring; check the existing wall plate has the expected terminals.
• Power: Some smart models need a common wire for constant power; verify one is present or plan for an alternative.
• Schedule type: A 5-2 day model suits regular weekdays, while a 7-day model fits households with varied routines.
• Voice ecosystem: Match the thermostat to the assistants already in the home rather than adding a new one.
• Installation: DIY-friendly models save on callout costs, but complex wiring should go to a qualified heating engineer.

Frequently Asked Questions

1. Can a smart thermostat work with a back boiler?
   Yes, provided the boiler’s controls present a conventional single-stage system and the wiring is compatible. A heating engineer can confirm this before purchase.

2. Do these thermostats need a neutral wire?
   Some Wi-Fi models draw constant power and need a common wire, while basic programmable units often do not. Check the existing wiring first.

3. Is a 5-2 day schedule enough for a back boiler home?
   It suits households with a regular Monday-to-Friday routine. Homes with varied days benefit from a 7-day model.

4. Can the heating be controlled from a phone?
   The Wi-Fi models here allow remote scheduling and adjustment through their apps. The budget programmable unit must be set at the wall.

5. Will a smart control lower heating bills?
   Scheduling and remote control reduce wasted heating, and Energy Star certified models are designed with efficiency in mind. Savings depend on how the system is used.

6. Is DIY installation realistic?
   Yes for compatible wiring and DIY-focused models, but anything uncertain should be handled by a qualified engineer.

Bottom Line

For most back boiler households, the Honeywell Home RTH9585WF1004 Smart Color Thermostat is the best balance of seven-day flexibility, a clear touchscreen and connected control at a sensible price. Buyers on a tight budget can drop to the X2P, while those wanting multi-assistant support should choose the ecobee Enhanced. Check the current price on Amazon before deciding.