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Boostmaster 4 Hour Electronic Boost Timer

£34.80 £29.00
In stock
Delivery Time:
Next Working Day
3 Years
Quick Code:
Order Line:
01977 663331
  • 13A (3kW) loading
  • Easy to use push button control
  • Power status LED indicator illuminates boost button

Boostmaster 4 Hour Electronic Boost Timer

Easy to use push button control The TGBT4N is a boost timer for immersion heaters, room heaters and light switches.

Simply press the button to increase the ON time for up to 4 hours.

This timer gives your heaters a boost with option of 15 minutes, 30 minutes, 1hr, 2 hr and 4 hours for all heating, ventilation and lighting requirements. (a light switch may be replaced by this unit if a neutral is available).

The Boostmaster fits on a single gang wall box, flush or surface, 25 mm deep and above. It can be instantly cancelled or reset, the LEDs flash to give a warning of time out.

The blanking plate can be removed to allow an appliance cord to outlet from the lower front.

  • 13A (3kW) loading
  • Power status LED indicator illuminates boost button
  • ON time can be increased in 4 steps: 0.25, 0.50, 1, 2 & 4 hours
  • Fits standard flush or surface mount boxes min 25mm deep
Product Code TGBT4N
Timer Mode Boost
Setting Type Digital
Operating Temperature -10°C to 40ºC
Cable Connection 1.5 x 2.5mm 2 Flexible Cable
EC Directives Conforms to Latest Directives
Switch Rating 230V AC 13A Resistive (
Operating Voltage 230V AC
Height (mm) 85
Width (mm) 85
Depth (mm) 31







Boostmaster 4 Manual (195.53 kB)

Where is the Boostmaster made?

UK EAN: 5012483011300

What is the max projection from the wall socket?

Maximum projection 22mm

Can the Booster be used with any heater?

Yes the Boostmaster is ideal for controlling any heating appliance up to 3kW. The Boostmaster replaces your existing plug socket and the heating appliance is hard wired it the Boostmaster.

Can the 4hr Boostmaster be used with any existing wall socket?

The 4hr Boostmaster is designed to replace an existing single gang connection, socket outlet or fixed appliance outlet. The unit is capable of forming part of a ring main (the terminals can accept 2 x 2.5 mm sq.cables) or terminating a spur off the ring main. The controller requires a minimum depth of 25 mm within the wall box!

Can the Boostmaster be used with lighting?

Yes the Boostmaster is designed to replace any existing single gang connection, for example standard light switches. The permissible loads for lighting are 5A inductive, 1000W filament lamps, 500W fluorescent lighting and 100W for low energy lamps.

Our Delivery Charges and times are explained:


Delivery Charges
All deliveries have a standard charge of £7.99 + VAT up to 20kg. Where stated, certain products are delivered FREE of charge (mainland UK only*). Check the description of the desired product and if it says free delivery then you will not be charged for delivery*

Extra Charges
Where the weight is over 20kg we reserve the right to charge more dependent on product type and delivery postcode, our customer service team will be in touch and inform you of any extra charges before we despatch.

Delivery Times
All products will have a delivery time stated in their description. Next Working Day - these products will be delivered Next Working Day if ordered before 12.00, or in certain circumstances up until 4:00 pm. Please call if you require a Next Working Day and we will try our best to get it to you. Certain products will state within 48hrs, within 3 Days or within 5 days. These products will be delivered within the time stated. If you require delivery on a certain day please put this in the comments and we will aim to deliver on that day.

Certain products such as radiators are delivered after 5 working days, when purchasing a radiator please put in the desired delivery date which is 5 working days after ordering. In some cases, stock permitting, we can get radiators out sooner. Please call or put in the customer comments if you need something urgently and we will try our best.

Saturday Deliveries
We can arrange for a Saturday delivery for certain products, please call 01977 663331 for more details.

Please note: Although we will do our utmost to deliver your product in the time stated we cannot be held responsible for any unforeseen delays. Please do not book a plumber, electrician, etc until you have received the goods as we will not be held responsible for their time. Please read our terms and conditions for further details.

additional charges may be applicable dependent on your location please double-check with our customer service team

Our Returns Policy - Please click here!