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The Giannoni stainless steel heat exchanger used by Baxi and Vaillant is quite fragile outside its normal operating pressure. The stainless steel tubes can distort if the system is over or under pressure and this may have caused or contributed to the blockage despite the system being clean.

A possibility is that combustion isn't clean and this is sooting up the sensor. I would get someone else in to have a look.

Yes Wave is transferable with a property. Also BG want to spy on your energy usage with Hive whereas Worcester have promised the data belongs to the homeowner.

Have you seen the new Worcester Wave heating control http://www.worcester-bosch.co.uk/mobile/boilers/wave-and-boiler-controls/wave-control-system Perfect for your new Worcester boiler. The great thing about this control is unlike Hive it will vary flow temperature rather just switching on and...

If you've two bathrooms and you want to make full use of the flow rate then you buy an unvented cylinder. Worcester do a 40kw CDi combi but going down the combi route is likely to lead to dissapointment if you have two mains showers.

Worcester have an offer where if you fit a boiler with one of their cylinders you can get a ten year guarantee on the boiler with 25 years on the cylinder.

You don't need a new boiler. Contact Worcester service if the baffles are stuck and your heating engineer can't be bothered to get them out then Worcester service will sort it.

Correct if the temperature is being raised to 60°C. An option is turn the temp down on the cylinder and sterilise once a week or so. The risk of legionnaires is exists but is unlikely. The fact that you ran the heat pump for 24hrs and the heating bills went up suggest that the pump may be...

Re the original question the current draw tends to be largest at start up. Try and go for a heat pump with soft start to avoid problems.

You need a COP of at least 2.7 to be cheaper than oil.

Re the hot water 1) the temperature should be raised to 60ºC once a week to sterilise the cylinder. 2) Heat pumps aren't great for heating hot water as the required rise in temperature is greater than they can normally deliver particularly in cold weather. Grant do sell a hot water boost...

We are having our kitchen re-fitted next week and I'd like to install under cabinet lighting. We are planning to go down the LED tape route and would appreciate help and advise on the following. 1) What specification of LED should we go for and number of LEDs per metre? 2) Should we use IP...

I think it sounds like the heat pump is undersized. 8.75kW sounds small for a 4 bed house. Expect 10 to 12 kW for a 4 bed detached insulated house unless it has been insulated to the highest standards. If this is the case then the backup immersion will kick in whenever the weather goes cold and...