System Boiler or Combi-boiler

EssexExile

Rosa_Damascena said:

mrsmsebastian said:

EssexExile said:

Don't worry about having to heat the whole tank to get some hot water. Once heated it will stay hot all day, or until you use it.

Really!? That is good but will the boiler automatically turns off after the water is heated or will it stay on to keep the water hot?
Apologies for too many questions. I would rather know something before the boiler man comes so I can tell him what I want which will be suitable in our house.
Thank you for your help!

If it remains switched on, it stays hot until the temperature drops and then it kicks in again. I have my boiler heating the water for 10 mins in the morning and its stays hot until I have another wash before bed.

We know we won't want a lot of hot water during the day so it heats up in the morning then goes off until the evening. When the timer turns it back on quite often nothing happens as it's still hot enough.

Ectophile

mrsmsebastian said:

tacpot12 said:

I would go with a system boiler. Note that what you need is actually an open vent boiler because you have a tank in the loft. System boilers would normally be used with a pressured hot water tank. These deliver hot water at the same pressure as cold water, but need to be inspected/service every year so are much more expensive than the system you currently have. 
I had my open vent boiler replaced last year with an Intergas HRE OV boiler and have been very pleased with it so far.

Thanks for the reply. 
The water tank in the loft is not needed in system boiler is it? So I am hoping it will be removed and only water heating tank will be left but if the system boiler is much exoensive to run then shall I go with combi-boiler?
The only thing I am concerned with combi-boiler is the water pressure and temperature if multiple taps is being used at the same time.

Most system boiler set-ups require a cold tank in the loft.  That's the way they have always been done.

The exception would be if you get a sealed pressurised hot tank.  If you are thinking of going that route, make sure the person who does the install is qualified to do them.  An exploding tank of hot water would not be good.

bris

With 5 people hot water will be depleted in a tank pretty quickly so the boiler will be running longer.  With just one shower in the house the combi will be the best option, hot water on demand rather than constantly needing to heat a tank.

Tanks are good when you have more bathrooms, en suites etc that are used at the same time. In this case it's one at a time so the combi is perfect for the job.

southcoastrgi

You are confusing yourself,

a combi heats the water as you use it & are really only suitable for one outlet at a time, the heating side is sealed so fill up from the mains,

a system boiler is also sealed & filled up from the mains, this boiler contains a pump used to pump around the heating & to a h/w cylinder,

a open vented boiler uses a small header tank (In the loft) to keep the heating filled this will also be connected to a h/w cylinder,

Depending on your incoming mains pressure & flow the best option would be a system boiler connected to a unvented cylinder