How does it work

[GeorgeBramwell]

I came across a old floor mounted combi, a Worcester Heatslave. It must be 1970's /80's. It has a boiler and cylinder inside. I never had the time to figure out how it worked. Is it a thermal store with DHW take-off coil inside, like the older IMI Powermaxes? I was told this was the very first combi model on the market. Does anyone know how these old combis operated?

 

[charliechaplinspants]

Is it oil?

 

[GeorgeBramwell]

Is it oil?

Gas.

 

[nickso]

horrible predecessor to the highflow 400.

not seen one of these for a while but basically a conventional boiler with a diverter and pump added. coil heats the cylinder. its hot water priority so heating only happens if the cylinder is satisfied.

open flue versions are particularly nasty.

 

[GeorgeBramwell]

horrible predecessor to the highflow 400.

not seen one of these for a while but basically a conventional boiler with a diverter and pump added. coil heats the cylinder. its hot water priority so heating only happens if the cylinder is satisfied.

open flue versions are particularly nasty.

Do you mean it is a thermal store inside like a Highflow 400? What instantly heats the DHW?

 

[nickso]

cant remember TBH. dont think it has a PHE so it must be the coil reheating the cylinder water. could be wrong about that, its been years since ive seen one but i do know of a few round here still going, mostly open flue with next to zero ventilation.

 

[GeorgeBramwell]

cant remember TBH. dont think it has a PHE so it must be the coil reheating the cylinder water. could be wrong about that, its been years since ive seen one but i do know of a few round here still going, mostly open flue with next to zero ventilation.

Plate heat exchangers are pretty new, about 10 years. They transformed combis. Bubble heat exchangers were common in older combis. Most prob a thermal store with a coil DHW take-off. I believe they needed an F&E tank and the CH was direct from the boiler.

 

[nickso]

iirc the OF version needed an F+E. the BF was sealed. again im not certain.