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It takes about 10 mins to change a DHW thermistor but i charge min 1 Hr labour. I spoent a winter one year changing 4-5 thermistors a day on the ferolli optima 701 combi. The Housing association i subbied for all had the same boiler fitted . I was getting the thermistors for just £5 incl...

The land lord was ineviatbly doing it for financal gain, ie he was expecting a rent for the property. You do not have to prove your self competant. As long as you believe you are competant and adopt safe working practices hse will not roast you. If you charge money or expect payment of some...

is the presuure gauge is rising when you switch the heating on ? Could be the expanssion vessel. seen it loads of times when the heating is not used in the summer they dont realalize whats happening. could also be the pump on the way out. All combis work the same way Open tap or turn CH...

i take the cost of materials add 20% guess how many hours and 1 or 2 for safety(incase water main passes or the wall is a bugger to go through

there is no way of determaning if a diyer is competent so it is kind off up to you if you think you can do it or not. But you still have to install in accordance with the installation and use act. It is not illegal for your mate to fit your gas fire,cooker,boiler etc but it must be fitted in...

Bugger all of that if the boiler is firing up it is not the diaphram. Anyway i would be surprised if it had a diaphram as most manufacturers started using flow switches years ago. And if it is firing up with the inlet turned down it is definately not the problem. As for gas pressures *******s...

With warm air installation there are a lot less people tht hold the relevant certs to install/service/repair. I do have them but it is a rare occurance that i replace a unit nowadays.(i use to be a J&S subby) the thing with replacing the units are- things have changed since they were...