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I don't know if this is generally known but I wasn't aware of it until a Velux repairer (kindly) told me that some of these windows manufactured around 2001, see code below are replaced FOC, its a batch with code OOUE. I don't know if you contact them even if you have no cracks if they still...

Anyone with experience/views on this?. This, I believe, is a blocking code that trips the burner but when/if it resets. the burner will refire without any boiler reset. If this fault code is up while in CH mode and there is a demand for HW, will the boiler still change over immediately to DHW...

Some interesting dynamic (Wilo) pump curves, the effect of the different modes can be seen, select pump curves and input your data. https://wilo.com/ie/en/Products-and-expertise/en/products-expertise/wilo-yonos-pico/yonos-pico-25-1-6...

This pump has started to leak from the PLASTIC blank plug (one pipe system), had been installed (with boiler) from new as far as I know a number of years ago. Should a steel blanking plug have been used, and if so, why was the pump apparently supplied with this (plastic one) since it came...

Do Megaflo and other makers of UVCs with a internal air bubble state the net HW available, I reckon that if you don't want the cylinder pressure to rise above say 4.5bar when heated to 65C that the air space is 25% of the total volume so a 150L is 112L net, 200 is 150L, 300 is 225L etc.

The majority of Vaillant boilers are configured to run with flow temperature target temperature control, however, on most models, return target temperature control can also be selected which may give greater condensing and boiler efficiency. If anyone reading this is using this control, they...

Has anyone any experience of these which have a venturi to maintain the internal air gap?.

If a bypass flowrate of 420LPH is required at a pump head of 6M then the DU144 (top, below) will achieve this at a index setting of 0.5 but this is not possible with the DU145 (bottom, below) as it will only give a minimum flowrate of 800LPH at a pump head of 6M at its max index setting of 0.6...

I installed one of these (FantiniCosmi) about a year ago, its a very simple stat with only a adjustable differential of 0.3C to 2C. I have it set to 0.3C differential. I have noticed though that it switches in at its SP-0.15C and switches off at its SP+0.15, yet I have to increase the SP by 0.3C...

I only came across this very recently, it has several circ pump functions, one of which is, if selected, will control the dT by changing the pump speed. It defaults to 20C but is selectable, a very nice feature. Has anyone got one of these and are using this feature? Also do these boilers like...

What are your experiences with the above?, some Grundfoss models have this function but from reading posts on various sites it appears to be pretty useless as it seems to be set up to start the Auto Adapt on a very low PP (proportional pressure) setting resulting in a very low pump head as a...

Sony Bravia KD32W800 Bought one of these recently. it has a Freeview tuner, I also have a external Freesat box. I have my (rabbits ears) Antenna plugged into the TV socket and the Freesat box into the TV HDMI1 socket, the Satellite cable is plugged into the Freesat box. The TV "sources" show...

I have a number of these type tap sets installed for > 10 years, no problems with dripping/leaking, mains pressure is 3.2/3.7bar, my daughter who lives ~ 3 miles away, same water source, (urban) has two of these type installed, one, a toilet hand basin, gravity fed, no problems after ~ 8 years...

Most Combi Boilers now have DHW temperature control with setpoint temperatures down to 35C. A 35 or 40kw bolier may only have a minimum output of say 6kw and and minimm DHW flowrate (DHW flowswitch trip) of 2.0LPM. If a SP of 35C is selected then a flowrate of 3.44LPM will maintain that...

Are there fundamental differences in some of these TMVs?. The attached one, below, would seem to be the better type where a shuttle moves to balance the hot&cold flows, as it increases one flow it decreases the other to keep the mixed flow constant, necessary say in showers etc. I have seen...

Came across a 9 year old thread recently re the above "Boiler Cycling after fitment of new thermostat", the gist of which was that a TPI roomstat was switching very rapidly and the "Glowworm" boiler was refiring instantly but before the anticycle time had elapsed, someone ele stated that his...

How do I determine the above or pump head from this, second below, a Vaillant Ecotec 938, the Vaillant Ecotec Plus 438 gives the actual Hx pressure loss.

May have asked this previously but was looking at one of these recently and there are no slots in the housing to allow air in, the base appears to be flat, so how does it give/measure a accurate temperature?, it could be mounted with a few washers to make it stand out a few mm from a wall. The...

I have a 50 year old open vented CH system with a combined cold feed and vent. I have a service (isolating) valve on the F&E tank mains supply to its ballcock which I keep permanently closed, I open this ~ every two months or so to check for any leaks etc and I have NEVER seen a drop of make up...

Have a look at the attached please and tell me if the temperature returning to to the Boiler from point 8 is at the mixed flow temperature.