Help/advice required for my convential heating syst

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Hi

I live in a 2 bed house with a convential central heating system, i.e cold tank in loft, hot tank and 20 year old Baxi boiler. My controls allow me to set the heating to come on at specific times in day, but dont allow a central temperature setting.

Basically no central thermostat, all my Rads have an indiviual thermostat on them.

I used to have my boiler on for 40 mins twice a day during summer, thats worked fine for summer and provided sufficent lovely hot water. The winter I used to have it on for an hour twice a day, pre swopping my radiators. September just gone I had a full system flush, a magna clean fitted and 4 radiators replaced with brand, correct BTU size and 50% more efficent than the old 15 year old crap ones that were there before. and were useless.

For most of October I had my radiator thermostats on 0, just leaving the bathroom one on. Now its getting colder I turned all the indiviual thermostats on the rads to setting 3 out of 5 for warmth.

Since doing that with my boiler coming on for an hour in morning and an hour at night, the heating is fantastic and nice and warm. But the hot water is only luke warm alot of time, some times not even enough water to have a bath. If I wash up a couple of times there wont be enough hot water for a bath and most of the time the hot water is only luke warm. I appreciate I have convential system and it has to fill the tank of water to last until the next time the boiler comes on, but it has never been anywhere near like this before.

The pressure of the hot water is fine, and the problem with it being luke warm happens across all taps. I am wondering if now I have better more efficent radiators and they are on now the winter is coming, its pumping alot more water to them and then not leaving enough for the hot water tank?

I can't priortise my water to heating or tank as far as I am aware. I have bleed my system of any air locks and my electronic pump by the hot water tank is on setting 2 of 3 which I was advised was the correct setting.

Rather than just leaving my boiler on for longer, costing more money and meaning the radiators are on more. Does anyone have any ideas how I can improve things?

I am not even sure I can fit one and wouldn't know how to go about it or the cost of it, but would having a wireless central thermostat fitted help instead of a seperate thermostat on each radiator?

Is the only option to get a combi boiler, I don't really want that exspsense right not and I only intend to stay in this property for a couple of years.

I have average DIY skills but am by no means a plumber or electrician, any help/advice anyone could provide would be appreciated.

Thanks in advance.
 
Firstly I think the flush and magna clean on an old system was a waste of money.

Sounds like whoever cleaned the system didn't balance the radiators
and the water is finding it easier to go around the radiators than the hot water tank.
That or you have a blockage in the coil of the hot water tank.

I suggest you start by turning all the radiators lockshield valves (the non adjustable ones) down to approx 1.5 turns open.
See if your hot water now gets hot.
 

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