Why would i replace Hot water cylinder ?

[namsag]

You mean 15,021 btu

 

[apl]

15,021btu,s is slightly less than an average gas fire and doesnt seem enough to run rads off it.

 

[namsag]

If the output of appliance is 15000 and the rads are only 15000 btu or below then its enough . No one is saying its for full c/heating

 

[apl]

i dont understand why a water circulator would be used to run radiators it main function is to heat the cylinder you would be lucky to heat a couple of k2 rads when taking p/work and cylinder into account.15000btus would be no way near enough to do this.

 

[namsag]

What size k2`s 7500 btu ones .
Its simple its in johnson starley literature and its done and works . Same as it did on the maxol back boilers

Its for limited output 3 bedrooms 4000 btu`s a room hot water priority no one is saying its an ideal system but it suits some people. Who want heat right through the house but ducting was never installed.

 

[BigBurner]

APL he is on about adding a circulator on a warm air unit so it would be indirect cylinder not direct

I thought, but I might be wrong, that the add on circulator for the J&S warm air units was usually directly connected to a direct cylinder as APL is suggesting?

Only in soft water areas is a direct connection used.

 

[BigBurner]

namsag,i have worked and changed hundreds off warm air units and cylinders and they have all been direct cylinders.

would my existing electric emmersion heater tank be ok or should i get it replaced for £350 ?

If they are going to exchange and it remains the same - electric immersion, then NO.

If they are installing a gas water heating circulator in the Warm air unit, then Yes. Get them to quoter for a Janus gas circulator.