Flomasta 25901SX Single Channel Timeswitch Product Code: 7635G

Single-channel timeswitch for combi boilers. Factory-set clock.


  • Heating Only Timeswitch
  • 7 Day Programmable
  • 3 On/Off Periods per Day
  • Advance, Boost & Holiday Functions
  • 3 Pre-Set Programmes
  • LCD Display
  • Holiday Mode
  • 1 Year Guarantee


Switch/contact rating: 3(1)A. W x D x H: 145 x 35 x 99mm.
Additional Information
Technical Specification
  • Brand : Flomasta
  • Product Height : 99 mm
  • Product Length : 145 mm
  • Display Type : LCD Display
  • Product Type : 7 Day Timeswitch
  • Zoning Level : One
  • Central Heating Control Type : Timeswitches
  • Suitable Use Type : Fits Industry Standard Back Plate
  • Model No : 25901SX
  • Product Width : 145 mm
  • Product Depth : 35 mm
  • Pack Size : 1
  • Installation Type : Easy to Install
  • Compatible Boiler Type : Combi Boilers
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€24.95 Incl. 20% VAT

Add to Wishlist

More Items to Consider

Loading... Loading...
Flomasta 25901SX Single Channel Timeswitch is rated 3.2 out of 5 by 9.
Rated 2 out of 5 by from No good for shift workers! No backlight, hard to see properly, you will need a magnifying glass to read the instructions. Telephoned Screwfix head office on advice to get the time clock to operate from 7pm until 7am, but no advice was given except to read the instructions. Having read the instructions front to back there is no way of setting this unit to come on at 7pm until 7am. Its going back in the box and a full refund sought. If your a 9-5 person and go to bed at 10.30pm then you will be ok with this time switch.
Date published: 2017-08-04
Rated 2 out of 5 by from disappointing I tried this as a substitute for the Horstmann C17 which Screwfix have discontinued (and which is ludicrously expensive elsewhere). Compared to the Horstmann (and Drayton LP111 and others) this lacks an OFF/ONCE/ALL DAY/CONTINUOUS function so if you set it up for typical usage where occupants are out during the daytime, there's no easy way to flip it to on all day (e.g. when people are home during holidays); the occupants would have to keep using the advance or boost buttons. . Also the instruction manual is tiny and not very easy to follow, and not available online so if/when you lose the original there's no easy way to get a replacement. . I've marked Reliability as one star because there's no option to leave it blank and it would take having several fitted for several years to assess reliability with any accuracy.
Date published: 2017-02-10
Rated 2 out of 5 by from Flowmasta timeswitch Would never recommend nor install this product ever again. No backlight display. Extremely difficult to navigate and to explain to customers. Better off getting the cheaper centaur c17 timeswitch
Date published: 2016-12-10
Rated 4 out of 5 by from Excellent value Used this to replace an old Landis mechanical switch (only running on one channel). Instructions are minimal but was able to work out that my boiler needed a link from the live feed (easily adapted using a link wire) and everything else, including the old backplate and wiring positions stayed the same. Fairly easy to program but could really do with a backlight for the screen. Excellent value for money, if you only need a single channel controller then there is no need to spend any more than this.
Date published: 2016-11-05
Rated 2 out of 5 by from Works but.... This unit works OK and is reasonably priced but trying to program it is like eating soup with a fork! I'm not sure that getting a more expensive one would be any easier however as they all seem to be that way.
Date published: 2016-10-31
Rated 5 out of 5 by from Great Price This item does come with the UK backplate which converts the pins on the controller to screw terminals for your wiring. (Screwfix says it does not). It does not come with the backbox that goes in the wall or on it. The controller is not very intuitive but if you read the instructions it is simple to use and has some nice features, such as being able to set a program up for one day and copy that program to other days. This controller allows 3 on off periods per day but each day can have a different set of periods. For the price this is an excelent controller and is a superb replacement for the mechanical timmer i had before. You will need a good understanding of circuit wiring to connect the right wires to the right pins but the manual does give a circuit diagram of what the unit does.
Date published: 2016-06-08
Rated 4 out of 5 by from Good value time switch Bought to replace a mechanical time switch which had failed. Lots more programming options with this and once you read the instructions easy to set up and use. Good Value. Easy to install.
Date published: 2016-01-07
Rated 3 out of 5 by from Floats Manual not instructive Read the instructions if you do not want to use defaults. Otherwise good value for money. Note connection block on left so you may end up with a patch to paint
Date published: 2015-10-16
  • y_2017, m_9, d_24, h_3
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_9
  • loc_en_GB, sid_7635G, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix-ie