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Thank you for your time and help me understand. The corrosion is on the outer case on the top of the boiler. I think [I could be wrong here] the casing is so thin metel covering in Potterton Prima 80F. This seem to show signs of corrosion from fine occasionaldrible from the junction...

Hi Dan_Robison, I am not a DIY man. Sorry if the question is meaning less. I am just researching about my boiler that has some corrosion on the top cover. I was reading in another about positive and negative pressure boilers. Mine heat only open vent and not a sealed one. What is your...

Hi In Potterton Prima 80F on the bottom of the Unit situated the COMBUSTION CHAMBER and above it is the HEAT EXCHANGER and on top of this is the FAN and to it connected at the summit above top the FLUE ELBOW to leave the system to the out. Now I think it is negative pressure unit as the Fan...

The boiler playing up!!. I also find on the top metal covering of Potterton Prima has corroded and a small hole on the fascia. Awaiting for the Gas Safe installer to take look at it.

Thank you D_Hailsham & ianmcd. My Feed cistern in the loft has an over-flow pipe and help avoid a leak in the loft. Have I understood correctly in that, if I go for sealed system due to pressure raise initially, I may encounter leak? if that is so where should I expect the leak from?

Thank you Tony. I am keen to keep my exisiting plumbing inplace. Will the feeder and the Expansion cistern become obsolete in a sealed system? Can I stay with Open Vent Boiler under present legislation? Sorry to ask too many questions. I am awaiting for my Corgi registered installer to...

Thank you ianmcd. If I could qualify my question further-I do not want a Combi boiler. What is the equivalent to my exisiting boiler that will fit in witout any need for replacing my existing timer,thermostat,and the radioter connections,cistern connections/ Would you be able to suggest any...

Mine a 4 bed-room house. The boiler is situated in the car garage. We have a hot water cylinder in our airing cupboard fed from water cistern in the loft. Also in the loft another small cistern - I suspect expansion cistern. Timer and thermostat in the kitchen for the water heating & central...