Boiler / cylinder setup

[Paulhar]

A customer of mine has been using a gas-fired calorifier to supply hot water to his hmo, this has now given up and is beyond repair so we are looking at replacement set-ups. The simplest option seems to be to have a gas system boiler connected directly to a 250 litre cylinder and I am looking at an 18kW one as the previous gas burner was rated at 14kW. My concern is that I don't think enough heat will dissipate in the cylinder coil and that the boiler will modulate down in a matter of seconds. Is there any way of calculating this or does anyone have any experience? There is the option to go for a solar cylinder and link the two coils together if this will help. Any thoughts much appreciated.

 

[Last Plumber]

The method you are considering will not perform the same as the set up he/she now.

Why does the customer have a direct fired water heater?
What type of building, commercial?

 

[ShaunCorbs]

You need to look at high re heat ones also match the coil kw to the boiler kw and you should get the reheat time advertised