Little hot water in new flat

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Little hot water in new flat

Post  JonnyJP on Thu Dec 05, 2013 9:41 am

Hi,
My friend and I have recently moved into a new flat which has a PulsaCoil A class boiler and we're having problems with hot water.

Both on-peak and off-peak switches on the wall are on; the off-peak is connected to a timer which comes on at midnight and goes off at 7am.

In the morning, my flatmate has a shower with hot water, nothing too time consuming just 10 minutes. When I come to have a shower the hot water runs out immediately. Of an evening there is no hot water to do the washing up! There is a red flashing light (about 1sec frequency) on the unit. We had some 'engineer' round (not a Gledhill one) who thinks there aren't any problems with it although at the visit he said there was possibly a fault with a component or the board.

We can use the boost during on peak times but it doesn't heat the water immediately. This also will cost a lot more.

When I've had these kinds of boilers in the past, setting the off-peak to heat between midnight and 7 is sufficient. I've only had to top up with a boost if, say, we've had a lot of showers / baths that day.

Any ideas? I wouldn't expect to have to have on-peak boost on first thing in the morning and then later in the day. I'm going to run through the full diagnostics at the weekend but it's really annoying at the moment so need help from someone who really understands these things!

Cheers

JonnyJP

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Re: Little hot water in new flat

Post  mike on Thu Dec 05, 2013 2:09 pm

First check the unit is full.
Next you could have another problem.
Could be a faulty sensor.
A relay.
A 10 minute shower at what pressure?
Mains pressure hot water.
If the unit is a 120 / 125 litre one.
And the shower is delivering 5 litres a minute 10 minutes = 50 litres of hot water.
But chances are the shower is delivering more than that.
Could be 10 litres a minute
See where I am going!
You can get an Eco saver which fits between shower hose / shower control.
Mike

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Re: Little hot water in new flat

Post  Mario.S on Thu Dec 05, 2013 3:10 pm

mike wrote:First check the unit is full.
Next you could have another problem.
Could be a faulty sensor.
A relay.
A 10 minute shower at what pressure?
Mains pressure hot water.
If the unit is a 120 / 125 litre one.
And the shower is delivering 5 litres a minute 10 minutes = 50 litres of hot water.
But chances are the shower is delivering more than that.
Could be 10 litres a minute
See where I am going!
You can get an Eco saver which fits between shower hose / shower control.
Mike
Hi
Regarding to pressure ( flow rate) 5 litre/minute is a good flow for a conventional cylinder. Modern main pressure taps running with 12 to 18 litre / minute. So 10 minute ( ish) shower means about 100 to 120 litre hot water user !!!! So there is not match left after this. ( page 24 in the manual !)
regards Mario

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Re: Little hot water in new flat

Post  mike on Thu Dec 05, 2013 3:41 pm

You can find a container, say 5 litres or so.
Run the shower and time how long it takes to fill.
5 litre fill in 30 seconds would mean 10 litres a minute.
And so on.
Mike

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