Hi there. Unfortunately you seem like you have had a bad experience with this plumbing firm due to bad advice. They should of originally advised you to keep the system you had with the pump and tanks as no combi would really ever match the flow of hot water if you had a good quality pump. What they have now quoted for seems fine but at the same time a waste of time and money.
J, To raise points about the Combi Boiler Water Pressure; It is your mains Pressure combined with Hot Water Flow Rate that will give you a decent pressure with consistent Hot Water; 1) It could be your Cold Mains pressure is too great and may need a Pressure Reducing Valve Fitted 2) Or you water pressure is not sufficient which means a Mains Booster 1.6 Bar to be fitted To raise points about the Combi Hot Water; 1) It sounds like the Combi Boiler fitted maybe only has a small flow rate of Hot Water and a larger Combi should have fitted. Other Points; 1) They are correct you cannot have a pump attached to a Combi System 2) It is not advisable to fit a pump to a Combination Hot Water Cylinder either due to insufficient Head of Water Held unless you have a separate Hot Water Cylinder and Cold Water Storage Tank minimum 60 Galleons. 3) The refitting of Hot Water Cylinder, valves, etc. is fine, as long as they have a mechanism that will turn of Combi automatically if no Heating Demand is necessarry, e.g. No Heating required but Hot Water to be heated and reaches temperature, then a mechanism that instructs Combi to turn off, otherwise the pump will continue running in the Combi with no where for the water to circulate unless they fit a Bye Pass loop. So, I would not go down this route if it was me has Combi not designed to work like a Heating Only Boiler. If I was you I would persist with them to ascertain enough Mains Pressure to operate Combi correctly and that the minimum flow rate of the Combi for Hot Water is 12 litres per minute at 55 degrees Centrigrade. The mistake people make when fitting a Combi is not to consider Hot Water demands and thus usually fit a Combi that will do Central Heating adequately, but to get customers Hot Water Demands it may be necessary to increase Combi size by another 5kw to allow for this. Hope this helps, Bill Pipe Dreams Plumbing Services Bournemouth (we can be found on Google under Plumbers Bournemouth)
Hi When you fit a combo you have to remove the parts the company have done, your problem might be that your cold water to the bathroom is from storage and not the mains which might be the result of your pressure problem, ask if this has been done but you should have good pressure at your shower with a combo Iain
1] I assume that the flat is two to three of ground level. if this is the case it is debatable if an electric shower will work 2] a shower pump is not designed to run of mains water and is against the water regs therefore not safe you don 't say how many flats in the block with out a site its not worth commenting further
Nick shares his story of finding local tradespeople in his new area.
