"I'm an electrical contractor. I was called to a house that had a Horstmann Diamond programmer built in the 60's which was now sometimes sticking. I Spoke to Horstmann technical who suggested Horstmann 425 Tiara Programmer. What an excellent choice, a breeze to install and all working o.k.. If this one lasts as long as the old Horstmann Diamond, the customer will be well happy. This item was cheaper from Screwfix than any of my electrical wholesalers. Well done Screwfix."
"Bought as a replacement for a Switchmaster 900. Job only took 30 mins before system was up and running again. Instructions even included corresponding terminal connections between the 2 models making installation a doddle. Chose a mechanical model for ease of set up.Who needs loads of settings when twice a day is sufficient."
"I have bought this to replace the exact same model which I clumsily broke when switching the advance button which is an added advantage of this product. I would not want to have another type as I have been so happy with this one for many years"
"My central heating timer control failed after 18 years of excellent service. Screwfix were able to offer me the same model which plugged into the existing socket. Back up and running in a few minutes.
"I was initially quite impressed by this programmer: it seemed to work satisfactorily, and appeared to be good value for money. However, after approx 18 months of operation, I experienced erratic operation of my heating system: domestic hot water (DHW) worked OK, but central heating often failed to start. (My heating system uses a motorised 3 port valve, and both DHW and CH are pumped.) After much investigation, I found that the fault was caused by intermittent closure of the DHW switch, when in the "off" position. I have dismantled the mechanism, and the fault is caused by poorly toleranced plastic in the switch leverage system.
"Product was bought on cost compared to other timer controllers. Performance was poor. This may have been a faulty unit but did not meet customers expectations. Slider controls were very stiff and would overshoot. Program indication was only viewable through a very small hole and the number is tiny. Swapped unit for Danfos which performs much better."