dhw

Hi all, I’m in the middle of a full‑scale renovation of a very tired property — original 40‑year‑old fan boiler, vented cylinder, single‑glazed metal windows, the lot. The house is being stripped back to brick with new floors, ceilings, EWI, cavity insulation, new roof, the works. I’ve been...

My Glowworm Flexicom 30cx was installed about 17 years ago. After DHW has been used, the boiler continues to run for about 1 minute and sounds like it's still pumping water around (normal operating, not an issue). However - the pumping sound has over recent years started to become a noisier...

Hi all, I have got a new Vaillant EcoTec 418 installed recently and noticed that the set hot water temperature is being ignored, instead it gets generated by flow temperature. Also diagnostics menu says that DHW hours are 0. Could this be a result of an incorrect wiring? I'd like to set DHW...

Hi All Vaillant ecotec 637 plus, S-plan external cylinder, eBus control. When in DHW mode the boiler acts weirdly as in it goes full on for ~5 seconds then minimum output for ~5 seconds and this forever until it stops. It's shooting for 75 degrees and with the behaviour of full on / full...

I have a Potterton Gold Combi 28 HE on a brand new system following full renovation. However I am unable to get a consistant flow of hot water to any outlet. The temperature holds as hot for around a minute before fluctuating between luke warm and warm. Boiler has previously been sat in dry...

Hi All, I'm currently pulling the components together for new heating and DHW plant in my property. I'm proposing a Bivalent system for various reason, Gas boiler and ASHP combo. My question is on the DHW generation. I currently have a PHX and DHW cylinder (no coil) to get the most from the...

Hello The boiler is Vaillant turbomax plus 824e, CH works fine. If one hot water tap is open, the boiler works normal too. However, when the second hot water tap or shower on its own is turned on, the boiler starts making noise that gradually gets louder until I shut the boiler down. Could be...

I’m having the usual constant vs timed hot water debate with myself and just need to know how the tank behaves when supplying water. As far as I understand (and I’m probably wrong), if your DHW is timed, the boiler will come on and heat your water to 60C and go off. If you then go and have a...

Hi. Sorry to ask this but other posts I’ve seen don’t cover my arrangement. 5 bed detached with two main bathrooms plus utility and another WC. Have a newish 40kw combi. Incoming water pipe is 15mm and good mains water pressure internal pipe work copper with little bit of pvc from a previous...

Hi All Apologies in advance but I will try and be thorough as it's my first post :-) Need some advice, I have a Keston c36 which has been regularly maintained over the last 10 years since moving into a 6 bedroom Victorian terrace. Yes, many parts replaced and maintain spares just in case ;-)...

Info: Worcester Greenstar Heatslave Drayton MA1 Mid Position Valve Actuator Summary: Had to replace the valve actuator as the old one was sticking. Wired up the new one with the same pinout as the original. Tested but got the following failed outcome; Off = DHW Water On = DHW Heating On = CH +...

Had a quick search but no answers... Plan is to use a plate heat exchanger on the thermal store to provide mains pressure hot water to 2 bathrooms, objective is that both bathrooms can be used simultaneously (one is bath and shower, the other is shower only) without massive temperature/pressure...

Hi, Same old problem of long draw off, I decided to put a recirculation loop in. A bit new to this and probably should have researched a bit better. I've looked for similar problems on this forum but can't see anything similar. Apologies if I've missed it. As I am refurbishing it was easy to...

What flow rate does DHW turn on? My boiler works fine for CH but I have noticed recently that DHW has been problematic. The HW sometimes does not turn on until the tap is turned fully on and when I back off the flow rate to get hotter water, it turns off again. Usually I can get it so that is...

Hi - We have a Halstead ACE High exhibiting the following issue: At certain times, upon ceasing demand for the DHW, the boiler will continue to see demand. The piston from the diverter value remains extended, pushing the micro switch and so keeping the demand for the hot water. At this point...

My mom has a Biasi M90B 24S, (construction year 2009), previously she had several problems with this combi boiler, every now and then it needed a HE cleaning, sometimes CH wasn't operating, other times HW. Lately she experienced the following: - How water through the taps came in waves: hot for...

Getting towards dhw in the House of Pain. Hot water source will be mains through a plate heat exchanger on the thermal store, supply pipe is 25mm into the house then 22mm to the hex. Pressure and flow both good. Bathroom 1 (6 metres) will have bath and overbath shower and basin Ensuite (16...

I have Triple AQUASTAT relay L8124A Honeywell controller on my hydronic heating boiler. It is setup like this for hot water heater as well. I don't have use it for hot water, I have electric hot water heater. How do I stop it from running the boiler to keep the temp for the hot water. I only...

The issue; Boiler when power is on has the green water light on constantly (not flashing). Hot water works fine, fires up when taps turned on, pressure fine there also Pump can be heard continually pumping nothing after the water tap is off (not the usual 30 seconds or so before it normally...

I have a Grant Vortex 26, and it is losing pressure. It can be at 1 bar in the evening, and be down to 0.3 bar in the morning. When the heating is on, it holds pressure, but as soon as you turn on hot water somewhere in the house the pressure drops. I thought the two systems were separate, but...