Running out of hot water

We have recently purchased a property with a Pulsacoil 2000. We have found that there is enough water for one shower taken early in the day, but a second one will run cold half way though. Even if only one shower is taken in the morning, come the evening and time to do the washing up, the water runs luke warm at best. I've had a feel in the feeder tank and the level appears to be alright, although it maybe could be topped up a little.

We only run the overnight off peak heater, while on the occasions that we have used the booster heater, it has made little difference. Any idea what the problem might be?

Many thanks.

Hi Ben,

Clearly your Pulsacoil does not have enough hot water stored from the overnight re-heat. I've encountered this problem a few times and found in each case the unit concerned is a small one and the shower performance phenomenal, leading to the whole tank being drained of hot water in about 10 or 12 minutes of showering...

What capacity is your Pulsacoil? (Data label inside the front cover.)

How fast does your shower run? (Measure in seconds how long it takes to fill a ten litre bucket.)

A shower delivering 15 litres a minute, one third cold/two thirds hot water mix, will drain a 100 litre Pulsacoil (or any other 100 litre tank) in ten minutes!

Another possibilty is that someone has been fiddling with the thermostat inside the Off Peak heater and turned it down. It needs to be at MAX.

It 'could' also be a failing heat sensor. Sometimes a failing sensor only works while the tank is really hot, and stops once a small amount of hot water has been used. Using the 'boost' heater generally restores hot water when this is happening though.

Cheers, Mike

ben wrote:We have recently purchased a property with a Pulsacoil 2000. We have found that there is enough water for one shower taken early in the day, but a second one will run cold half way though. Even if only one shower is taken in the morning, come the evening and time to do the washing up, the water runs luke warm at best. I've had a feel in the feeder tank and the level appears to be alright, although it maybe could be topped up a little.

We only run the overnight off peak heater, while on the occasions that we have used the booster heater, it has made little difference. Any idea what the problem might be?

Many thanks.

The capacity of the unit maybe undersized. Also it could be the flow rate of the shower exceeds the specified amount. The other problem could be incorrect thermostats installed so the water is not reaching the right temperature