Worcester Bosch Comfort Programmer vs Comfort I RF vs Comfort II RF vs Comfort+ II RF

Choosing the right Worcester Bosch heating control can make it easier to manage your central heating and hot water around your daily routine. However, with several products in the Greenstar Comfort range, it is important to understand how they differ before choosing a replacement or upgrading your heating controls.

The range includes a basic twin-channel programmer, wireless thermostat kits and more advanced controls with features such as load compensation, holiday mode and low-pressure notifications.

In this guide, we explain the key differences between the Worcester Bosch Greenstar Comfort Programmer, Comfort I RF, Comfort II RF and Comfort+ II RF to help you find the right option for your boiler and heating system.

1. Worcester Bosch Greenstar Comfort Twin Channel Digital Programmer

The Greenstar Comfort Twin Channel Digital Programmer (7733600003) is the straightforward option for controlling your central heating and hot water schedules.

Unlike the RF models, this is a programmer rather than a complete room thermostat kit. It allows you to set when your heating and hot water operate, with up to three adjustable time periods per day.

Key features

• Separate central heating and hot water programming

• Up to three adjustable time periods per day

• Seven-day programming

• Simple digital controls

• Designed for compatible Worcester Bosch boiler systems

Who is it best for?

This programmer is worth considering if you want to manage heating and hot water timings without adding a wireless room thermostat. It is particularly relevant when replacing an existing programmer, provided the new unit is compatible with your boiler.

Shop the product: Worcester Bosch Greenstar Comfort Twin Channel Digital Programmer

2. Worcester Bosch Greenstar Comfort I RF

The Greenstar Comfort I RF (7733600001) combines a plug-in twin-channel programmer with a separate, pre-paired wireless room thermostat.

This gives you scheduled control of central heating and hot water alongside room temperature control. The wireless thermostat allows you to position the room control away from the boiler, subject to the manufacturer's installation requirements.

The Comfort I RF also includes load compensation, which adjusts boiler operation in response to heating demand. Its performance depends on the boiler and the way the system is installed.

Key features

• Twin-channel programmer for central heating and hot water

• Separate wireless room thermostat

• Pre-paired wireless components

• Load compensation

• Programmable heating and hot water timings

• Manufacturer-listed 3% ErP package efficiency uplift under applicable conditions

Who is it best for?

The Comfort I RF may suit households looking to replace a basic programmer with a package that also provides wireless room temperature control. It offers more control than a programmer alone, without needing to select the more advanced Comfort II models.

Shop the product: Worcester Bosch Greenstar Comfort I RF Wireless Room Thermostat and Programmer

3. Worcester Bosch Greenstar Comfort II RF

The Greenstar Comfort II RF (7733600002) is a wireless programmable thermostat system with an RF receiver. It brings the programming controls together at the room thermostat, allowing users to manage their heating settings from one location.

The thermostat supports six adjustable heating temperature settings per day, alongside three adjustable hot water time periods. It also features a backlit display, menu navigation and a wireless signal indicator.

As with any boiler control, compatibility should be checked against the exact appliance model before purchasing.

Key features

• Wireless programmable room thermostat

• RF receiver

• Programming and control at the room thermostat

• Six adjustable heating temperature settings per day

• Three adjustable hot water time periods

• Backlit display and menu navigation

• Wireless signal indicator

• Manufacturer-listed 3% ErP package efficiency uplift under applicable conditions

Who is it best for?

The Comfort II RF is worth considering if you want programmable room temperature control alongside separate hot water scheduling, with the convenience of a wireless thermostat.

It is not the same as an internet-connected smart thermostat, so don't choose it on the assumption that it provides app-based or remote internet control.

Shop the product: Worcester Bosch Greenstar Comfort II RF Twin Channel Programmable Thermostat

4. Worcester Bosch Greenstar Comfort+ II RF

The Greenstar Comfort+ II RF (7738112324) offers additional heating control features, including built-in load compensation, holiday mode and low-pressure notifications.

The system includes a wireless thermostat and a pre-paired RF Key that connects to a compatible boiler. It supports up to six heating control timings and three hot water timings per day, allowing schedules to be tailored to your household.

It is also Boiler Plus compliant, subject to the applicable system and installation requirements. An optional Comfort+ Outdoor Weather Sensor is available separately.

Key features

• Wireless programmable thermostat

• Pre-paired RF Key for connection to a compatible boiler

• Built-in load compensation

• Up to six heating control timings per day

• Up to three hot water timings per day

• Holiday mode

• Low-pressure notifications

• Boiler Plus compliant

• Optional outdoor weather sensor, sold separately

• Manufacturer-listed 3% ErP package efficiency uplift under applicable conditions

Who is it best for?

The Comfort+ II RF is worth considering if you want additional features such as holiday scheduling, load compensation and low-pressure notifications alongside programmable heating and hot water control.

Important compatibility note: Check the exact boiler model before ordering. Compatibility information can vary between Worcester Bosch control versions, so do not assume this model works with every Greenstar boiler.

Shop the product: Worcester Bosch Greenstar Comfort+ II RF

Which Worcester Bosch Comfort control should you choose?

The right control depends on the features you need and your existing boiler setup.

• Choose the Greenstar Comfort Programmer if you mainly need scheduled control of central heating and hot water.

• Consider the Comfort I RF if you want a programmer combined with a separate wireless room thermostat.

• Consider the Comfort II RF if you want programmable room temperature control and separate hot water scheduling through a wireless thermostat.

• Consider the Comfort+ II RF if you want additional features such as holiday mode, load compensation and low-pressure notifications.

Remember that these controls are not universally interchangeable. Before ordering, check your boiler's exact model, the existing control arrangement and the manufacturer's compatibility information. If you're unsure which control is suitable, consult a qualified heating engineer or contact Worcester Bosch for confirmation.

Final thoughts

Worcester Bosch offers several heating controls to suit different requirements, from straightforward timed programming to more advanced wireless temperature control.

The most important step is to match the control to your boiler and heating system rather than choosing on features alone. Checking compatibility before purchasing can help avoid ordering a control that cannot be installed with your existing setup.