How does the Greenstar 30Si combi boiler work?

I Have a WB Greenstar 30si Combi Boiler. When the central heating is firing it produces hot water no problem. But, when it is just hot water on demand (with no central heating) it runs hot for the first 3 seconds or so and then drops off to about 10 degrees (ish). This is in a sink directly next to the boiler.

Why does Greenstar boiler heat water to 50 degrees?

It does heat the water to 50 degrees but only for the first few seconds then the temp drops off and dosent recover. Ok these boilers don’t have a secondary plate heat exchanger so the DHW is heated inside the main heat exchanger, this give us a couple of possibilities.

Why is my Worcester 30cdi hot water not working?

If the plate exchanger is blocked you may have other crap in the system, so just changing it may only solve the issue short term. I changed mine, then ran X400 in the system for 6 weeks before doing a mains water flush of the whole system, followed by a refill and new inhibitor. It now works like a dream.

What should my on demand hot water be?

Spoke to Bosch Direct and they say the on demand hotwater should run at around 55 degrees. I have to go back to the plumber and tell them its not resolved despite there assurances.

Why does my Worcester Greenstar boiler have no hot water?

I have a Worcester Greenstar 28i Junior Combi boiler. The heating is working perfectly but I am have no hot water. When I turn a hot tap on the boiler fires up and hot water is initially produced but within 10 to 20 seconds the water goes cold again.

What kind of TAP does Worcester Greenstar use?

The tap is a higher end Vado tap with 12mm push fit connector to 15mm copper end onto flexi connector. The system pressure is good. My thoughts are that the draw on the tap is insufficient to trigger the hot water start as just cold water runs through.

What’s the difference between cold and hot water in a combi?

The combi will however reduce the flow rate slightly on the hot water ,hence the difference on your tap of 2 lpm hot and 2.5 lpm on the cold.

Is the Worcester Bosch Greenstar 30cdi boiler covered?

In fact, I’ve just fitted a 30cdi system model, along with a Worcester Bosch cylinder and controls this week. What appealed to the client was that everything was covered under the 10-year guarantee, whereas the 30i system boiler would have only been covered for 8 years.

How many radiators can a 30cdi boiler heat?

It can comfortably heat 13 – 18 radiators and a 150-300 litre hot water cylinder. As the 30cdi is a system boiler, it will connect to your existing hot water tank so the flow rate to your shower and baths shouldn’t change.

Can a Worcester Greenstar boiler need to be replaced?

As you’ll see, an airlock in a pump on a Worcester Greenstar boiler isn’t exactly difficult to remove. However, if the problem with your Worcester relates to a heat exchanger, it might need replacing.

Which is the cheapest place to buy a Worcester Boiler?

The cheapest place to find a Worcester boiler online currently is Heatable — which starts at £1,649. If that doesn’t sound like the issue, head over to our article specific to Worcester boiler faults causing no hot water. If your Worcester boiler is leaking, this can cause low pressure and the boiler to lockout.

How is the Worcester Bosch Greenstar 30Si gas boiler rated?

Customer rating Make Worcester Bosch Model Greenstar 30Si Compact Combi Gas Boiler Is Condensing Condensing Efficiency Rating 94% Band Rating A Rated

What causes a Worcester Greenstar boiler to be noisy?

The two most common causes of the problem are: An airlock in the central heating pump. A heat exchanger that is kettling. Jump over to our article that covers noisy boilers here. As you’ll see, an airlock in a pump on a Worcester Greenstar boiler isn’t exactly difficult to remove.

What should I do if my Worcester Boiler is leaking?

When a Worcester boiler gets below a certain pressure, it will lock out. To fix this, you’ll need to re-pressurise it using the external filling loop. But, that’s only a temporary fix. To solve the problem with your Worcester, and clear any fault codes, the leak needs to be found and fixed.

When to use Worcester Greenstar 30Si hot water?

Discussion in ‘ Plumbing and Central Heating ‘ started by ilikewatchingtv, 30 Jun 2012 . Looking for some advice regarding my Worcester Greenstar 30Si. When there is a demand for DHW the water is hot for a few seconds, then cold, then hot etc…

What should my Greenstar I water pressure be?

Greenstar i Troubleshooting If you have a combi or system boiler, which are both sealed systems, there is likely to be a water pressure gauge on the front. This should be at a setting of around 1 bar whilst the heating is off. When the boiler is operating, the gauge will usually rise to 1.5 bar or more.