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Peter the plumber. Hi. Easy to work on. The latest Vitodens 100 is close to perfect for both the installer and the breakdown engineer. I almost hope they go wrong so I can work on them. The 200 is the king of boilers no other boiler available in the UK comes close. The 200 has many very advanced...

The building research labs would be interested in your technical update as they are probably less qualified to establish the facts than your self. After all they must be bonkers.

Download Honeywell wiring plans from their site and you will find a C Plan control layout. It was an upgrade from a gravity system to allow temperature control of the hot water. Gravity primaries had a habit of scaling up preventing good gravity circulation. I haven't seen a gravity system for...

I only speak as I find. Hope there as good for you as they are for me.

I may as well work for them. I fit lots of there boilers. Been to the factory in Germany worked for them as a contractor for some years. When another manufacturer with such great technology comes to the UK Buderus for example I will fit there boilers too. Fit some Coolants but their weather...

The boilers were blocking not the magnaclean.

As you may tell from my name I am biassed towards Viessmann. Look at there Vitodens range and investigate weather compensation, it's the business. Great boilers. With combination boilers big is better. Hot water is always limited to low flow compared to a cylinder. I installed a Viessmann boiler...

Look at the Vaillant a whole lot more boiler.

Sounds like your landlord got the cheapest engineer he could. I would call out a good engineer to fix it and give my landlord the bill.

This looks like a c plan gravity system to me. If it is it needs a descale.

I worked as a breakdown engineer for viessmann and observed that boilers with magnacleans fitted were blocking up. Boilers fitted with Spiro traps never blocked. I always fit them now and never have scale problems with my boilers. The early Vitodens boilers were fitted with Wilo pumps they are...

Why in heat exchange calculations are the conductive values of the materials used. The theory is similar to heat loss calculations for buildings. If your correct then why adjust the thermal conductivity of a structure under your analysis it will still lose the same amount of heat. I am not sure...

Dam this predictive Text shoe box and traffic.

At 300 a day charged an engineer would take between 8 and 12 per hour before tax. A bus driver in London gets just short of 9 how much do you earn as a heating engineer? And if you want to live in a show box and sit in tragic always come work in the smoke.

If an ally rad gives out ten percent more heat it would be ten percent smaller if sized by output. I can lead you to water but you just won't drink.

You are like a bull dog every time I give more reference you just say it's a guess but provide no defence for you own upon. As a direct comparison a single panel ally rad will give ten percent more out put than the same size double panel double convector rad according to a selection of...

The rate of flow of both the water and air are a factor but you could assume these to be equal for this example. You can look up the answer on pocket engineer urging the site is called.

1/UA=1/h1A1+dxw/KA+1/h2 A2 u= w/m2 I aluminium = 160 and steel = 50 A = m2 K = w/mk steel 16_24 aly 205_250 h= w/m2k water 500_10000 air 10_100 dxw = wall thickness m Try working it out. This is the formula do calculating the heat transfer through a heat exchanger or radiator.

The values are expressed as relation ship of energy per m2 per degree centigrade therefore 1m2 steel at delta t 60 = 60 x 50 Watts. Compared to 1m2 of aluminium = 60 x 160 .Watts. The relation ship is always 3 x greater per m2.

The values are expressed as relation ship of energy per m2 per degree centigrade therefore 1m2 steel at sets t 60 = 50 Watts. Compared to 1m2 of aluminium = 160 Watts