dhw

I have an oil heated circuit that now appears to be misbehaving and the main circulation pump running across the bypass wgen all the logic controllers are off. I think this is a new phenomena but cant be 100% sure. The ufh isnt on a logic controller, and its own booster pump is triggered by the...

I've got a DHW system with 2 storage tanks run in parallel - everything is well set up for the 2 tank operation, but other than completely removing one tank, and draining it to avoid legionella risk, is there a way I can keep both hooked up but only run the single tank (system was installed for...

I've got a DHW system with 2 storage tanks run in parallel - everything is well set up for the 2 tank operation, but other than completely removing one tank, and draining it to avoid legionella risk, is there a way I can keep both hooked up but only run the single tank (system was installed for...

Do thermal stores have the DHW coil mounted high up in the cylinder, nearly right at the top?. If so, and assuming a 300 litre store at 75C and if you draw off 100 litres of HW at 40C from cold at 6C do the whole contents of the store then fall, to 64C?. (63.8)

Having a chat with colleagues on this one to decide on best route. Existing 500L megaflo which does not provide sufficiant HW. Cold water entering cools the hot way too quickly and consequently the 500L is good for about half that. Coil is 54kw boiler is 80kw Cylinder options… The...

Morning everyone, Vokera gas combi boiler 35 degrees rising main 37 min to 60 max DHW temperature Top floor flat I turned my DHW dial on number 8 and took the hot water temperature from the kitchen sink and when tap was fully open it read at 51 degrees Celsius and when I reduced the tap flow...

Hi All, I trying to understand some settings or the way circulation pumps work. I recently had my Vaillant ecoTEC plus 637 fitted in my loft with a megaflo tempest tank. To control it all I'm using a sesoComfort wifi device or the app. Now there are settings for planning CH and DHW. There is...

Ravenheat CS80 T - CH works ok, fully working, modulating all good, but DHW only firing up for 30 seconds before cutting out burner, then tries again in endless loop. can see burner modulating, so thinking that side of things is ok. temporary solution: reduce DHW temperature demand to 5 degrees...

Hi Everyone, thought I'd pick your brains on some ideas I have for controlling a DHW secondary circulation pump circuit that I'll be installing as part of a new build. The DHW supply will consist of an Air-Water Heat Pump source linked to an unvented cylinder (at mains pressure). Never had the...

Hi, Is anyone able to give me some advice on a potential problem with a Worcester combi we looked at today please. Customer reported hot water on bath only getting luke warm. On first inspection we found the diverter valve passing heat down the central heating flow, so we've cleaned all the...

Good evening, Can somebody please advise what could be the reason I have scale in my DHW when I run the Bath or use the taps in the sinks. The cold water taps are clear. I have a thermal store and a heat only boiler which is been replaced this week. I have been informed by homeserve that the...

Hi all, Just had a Navien NCB 40kw combi installed by an approved fitter. The DHW rates of the boiler seemed promising on paper - 16.4lpm at a 35 temp rise and 22.9lpm at a 25degree rise. More than adequate for what we need. The only issue now its installed is that I'm not getting any more than...

Hi, looking for some advice/pointing in the right direction. We’ve got a glow worm betacom 24c combi boiler, installed by the last owners. Doing some research it seems as though they cheaped out. Having an issue where the boiler is making a loud groaning/ howling sound when running hot water...

Called out to this boiler last night.... No hot water... Heating fine... Run the hot tap, boiler does not fire.... Pin on diverter does not operate.... if I manually press micro switch boiler fires.... I am going to replace the diaphragm in the diverter valve tomorrow... However! I have...

Hi guys... Happy New year to you all.... Been out to a Worcester Greenstar Combi last week.... Problems with hot water not getting very hot.... Boiler is set to max on and I'm getting about 40 degree out of the tap.... Turned of the flow and return at the boiler to check diverter but this made...

Happy New Year. Okay, maybe the subject is a little dramatic, but hopefully I've got your attention for a few minutes 😀 After a recent upgrade of my CH system, which included a LLH and a new circulation pump, my trusty old Vaillant ecoTEC 637 Plus system boiler seems to be spending a lot of...

I want to have a completely separate CH boiler and DHW boiler. DHW easy enough, nothing to consider really, just plumbs to existing pipework CH option boilers are heat only or system. As I don't need the stored hot water tank, what would the setup be on either Heat only or system? What factors...

Question about DHW temp and Legionnaires. 1 year old Combi boiler, hot and cold water is delivered throughout the flat via the main water feed I have no water tanks or cylinder in flat just a combi boiler Does it matter what temperature I set the DHW to? Is there a legal temperature that the...

Hi I bought a Vokera Combi Boiler last year (Vokera Easi-heat plus 25c) and am looking for advice on one of the symbols on the DHW dial. On the DHW temperature dial after the tenth dot (going clockwise) their is a small green tap symbol with a little Z under it, what does that symbol mean and...

For around six months my Vokera Vision 25C has been making a short whistling noise when the hot tap is turned on. It started intermittently initially but now its everytime hot water is called for. I can’t recall any works to anything when it started. The noise lasts for two seconds max and I...