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Central Heating system split into 4 zones 3CH and 1DHW Honeywell 2 port valves controlled by Honeywell ST6400 controller and room thermostats. Just had Viessmann boiler as replacement and the switched live into the boiler from the wiring centre needs to be 24v incoming. The existing switched...

Just bought a 3 year old refurbished Vitodens but the removable programmer got broken during transit. Looking at the spare parts list, there are 3 different programming units, a weather compensated unit, a constant temp unit and a Comfortrol unit. My current set up is an S plan using Honeywell...

Having removed burner and electrode from Keston 170, was amazed by the amount of calcium build up inside the heat excanger, the top coil was completely encrusted with the stuff and a large build up in the base of the centre chamber. Is this normal or indicative of condensate drain problems or...

What would be a good (average) resistance reading to obtain when checking a HT ignition cable. Could some one explain how this cable provides flame sensor feedback to the control box to extinguish the spark. I would mention the make of boiler but ChrisR might just order me a skip.

I have a Flu light to fit and the incoming mains terminal has a 4 terminal block connector with L, N, E and a N/v terminal the Nv wire is blue and white and goes to the ballast. should the mains neutral be connected to the N or N/v

Can a single impeller pump be used to boost just the Hot water to a thermostatic shower mixer valve with the cold fed from cold water storage in the Loft. Wont there be a pressure difference at the valve ?

Could someone please enlighten me. Does it make a difference to which way the vessel is orientated ie Robokit at the top and air charge point on the bottom or Robokit and system connection at the bottom with air charge on the top. Looked up different suppliers instructions on the web but they...

Planning new Central Heating layout to include 3 Heating Zones controlled by 2 port valves. Can I have the 3 heating zone return lines as a common or do I need to keep them separate and Tee each circuit in before the DHW return and ABV return. Are single check valves an option. I am worried...

What do you think of this companies layout, noting the reverse flow through the 3 port valves. http://www.h2panel.co.uk/ I thought flow was only allowed in one direction ie AB to A or AB to B

How do I arrange a shower take off from my Heatrae sadia Megalife 210 vented cylinder as it doesn't have a normal male or female boss, ie for a Surrey or York flange. The hot water outlet is a 22mm stainless tube (integral with the cylinder) . I want to run 3 thermostatic mixer showers in total...

How do I arrange a shower take off from my Heatrae sadia Megalife 210 vented cylinder as it doesn't have a normal male or female boss, ie for a Surrey or York flange. The hot water outlet is a 22mm stainless tube (integral with the cylinder) . I want to run 3 thermostatic mixer showers in total...

Hi, Just joined New year project is to install new Central heating system. Current configuration. Solid fuel open fire with back boiler heating twin coil hot water cylinder upstairs via 28mm gravity with take off to pump feeding 2 rads, 2nd coil in cylinder not used. Proposed Config...