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• 
  @VickersDoorter3 күн бұрын

  Hi Andrew, found your videos by pure fluke! Louis from Croxley days - circa early 1970s.

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  @andrewmillwardwatford94102 күн бұрын

  @@VickersDoorter how are you ? 1978

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  @VickersDoorterКүн бұрын

  @@andrewmillwardwatford9410 Very good, living over Oxford way. We left Croxley in 1972 for Cambridgeshire, which was a bit of a shame as I liked Croxley. Drove through there about 6 years ago and it looked pretty much the same. I still remember Trevor and your parents very well.

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  @andrewmillwardwatford9410Күн бұрын

  @@VickersDoorter my mom is now 92 and my dad is 94. My mom has lost her consciousness but my dad is still all about himself

• 
  @andrewmillwardwatford9410Күн бұрын

  @@VickersDoorter was it your brother that worked at Watford Town Hall?

• 
  @VickersDoorterКүн бұрын

  @@andrewmillwardwatford9410 Incredible. Sid and Beryl if I remember correctly?

• 
  @foodforhumans91524 күн бұрын

  I am probably on the wrong track here but couldnt you tee the 2 pipes for the priority hot water in to the primary flow and return and then just use a nc and no motorised valve to switch over when priority hot water is called?

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  @andrewmillwardwatford94104 күн бұрын

  There are multiple ways of directing the water but the boiler still requires a signal to tell it we have demand and this relay does that job full stop this can be configured with a modified s or y plan

• 
  @foodforhumans91523 күн бұрын

  @@andrewmillwardwatford9410 and I guess the relay is the only suitable method for doing 2 pipe on opentherm? Your videos are a great source of info by the way.

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  @andrewmillwardwatford94103 күн бұрын

  @@foodforhumans9152 thank you for your kind words. The v200 doesn't have opentherm

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  @foodforhumans91523 күн бұрын

  @@andrewmillwardwatford9410 good to know, I didn't realize that.

• 
  @lukeb656518 күн бұрын

  What about draining cylinder

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  @andrewmillwardwatford941018 күн бұрын

  Some interesting question I didn't really look at it I just assumed there was a drain point provided. From your comment I assume that I'm not right

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  @lukeb656514 күн бұрын

  @@andrewmillwardwatford9410 Yes apparently you have to remove some things and syphon it out or so I heard. Not convenient

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  @andrewmillwardwatford941013 күн бұрын

  @@lukeb6565 why would you need to drain the cylinder

• 
  @normanboyes498319 күн бұрын

  Yes indeed why fit one additional pump to the system when you can sell 4@£2000 a pop. It would be interesting to hear the customers feedback on running costs post the rejig.👍

• 
  @edc156921 күн бұрын

  When you say half that temperature, what do you mean 74C is 347K, you don't mean half that.

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  @andrewmillwardwatford941021 күн бұрын

  I'm not sure why you've chosen Kelvin to calculate half of the temperature given in centigrade. Having said that the radiators could require more than half of the 74. Very often radiators on old systems need to run up to 50 degrees C but these have been upgraded and they're only in bedrooms so it's probably reasonable to expect temperatures up to about 40. ASDA job was never upgraded I can't tell you what the end design temperature for the radiators turned out to be

• 
  @joehaskett9023 күн бұрын

  Looks good. How are you controlling the cylinders? Is it one on each boiler?

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  @andrewmillwardwatford941023 күн бұрын

  @@joehaskett90 yes but pipe work is joined.

• 
  @leeedwards378323 күн бұрын

  Cracking job Andrew. Looks like fun. You have given me an idea. I am building a summer house which will have a shower and kitchen. I was going to install a small electric unvented but might use the insulated pipe you have for the 25 metres from my 300litre unvented.

• 
  @paul_my_plumbs_uk25 күн бұрын

  Were the extended handles galvanised conduit

• 
  @andrewmillwardwatford941025 күн бұрын

  1/2" IRON PIPE

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  @paul_my_plumbs_uk25 күн бұрын

  @@andrewmillwardwatford9410 15mm LCS?? OR GALV?? good money saving idea 💵✔️✔️💵💵

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  @andrewmillwardwatford941025 күн бұрын

  @@paul_my_plumbs_uk galvanised

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  @christianstewart0926 күн бұрын

  Very impressive

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  @anthonycannon74026 күн бұрын

  Looking good Andrew, serious amount of money wasted on the set up previously

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  @andrewmillwardwatford941026 күн бұрын

  Absolutely I find this quite typically on Commercial jobs

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  @CommercialGasEngineerVideos26 күн бұрын

  Thought that I worked hard but you're a grafter Andrew. Well done mate. Beautiful work.

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  @zali145726 күн бұрын

  Nice one mate 👍

• 
  @SkellyMrАй бұрын

  Andrew, this might be a daft question but I have the submount mixer on my 200W, the unmixed radiator circuit suffers from poor control and bedrooms too hot at night.setback. If I could rearrange the pipes on the submount to give me a second flow and return off the plate hx for a second mixed circuit, would it be necessary to retain a unmixed circuit off the boiler F&R?

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  @andrewmillwardwatford9410Ай бұрын

  It may be better to use the mixed circuit for the radiators underfloor heating. This is especially true if you still have room stats and actuators fitted to your underfloor heating system

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  @SkellyMrАй бұрын

  So run the UFH on the unmixed circuit? How does that work when generally rads run at higher flow temps? Also when generally the boiler flow temp is set (differential) to give a higher temp than the mixed circuit?

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  @andrewmillwardwatford9410Ай бұрын

  @@SkellyMr a lot of the answers I need to give would end up in me writing a book. I encourage people to call me when an answer is potentially very long as a few minutes on a telephone call can transfer so much more information than text. If you Google my name you will get through to my company and they can put you in touch with me. But the basic principle is that the flow temperature required at the mixer for the underfloor heating is likely to be very close to the radiator flow temperature or higher. Also most underfloor heating systems are still being fitted with room thermostats and actuators. So underfloor heating fitted with actuators can tolerate a slightly higher flow temperature without any significant negative impact what radiators circuits are unlikely to be controlled in the same way. Although thermostatic radiator valves can be used to limit the maximum temperature of a room it is a pain to have to turn them down at night and up in the morning rather than to use the programmed profile on the boiler.

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  @tobyrose3617Ай бұрын

  Out of interest what BMS are you using yo control the esbe mixxers? Or is it the boiler?

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  @andrewmillwardwatford9410Ай бұрын

  A v200 can operate 3 mixed and One unmixed circuit. Each mixed circuit requires a control to be added.

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  @UrbanPlumbersАй бұрын

  I have done it this way quite a few times, I just upsize the tees, It kinda works ok.

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  @andrewmillwardwatford9410Ай бұрын

  It's interesting if you look at CCTs through your infrared camera. You can see the level at which the Tees do not provide hydraulic separation.

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  @anthonycannon740Ай бұрын

  Another good video Andrew and I am definitely biased when it comes to Viessmann products

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  @markcostello2734Ай бұрын

  Have been using Viessmann now for a about 2 years - full range of boilers from 050/100/200 and now HP’s this year 2no ground source and 2 ASHP with 2 more in the pipeline - great products but you have to work hard to fully understand them Reason for the comment - I’ve always used their divicons never been brave enough to use separate pump & ebse mixers due to I might be longer wiring than plumbing - how about a video on the wiring or are you keeping that a trade secret 😉

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  @andrewmillwardwatford9410Ай бұрын

  The wiring of these is covered on a video I made a while ago. The wiring process is exceptionally easy so next time save yourself a fortune and try it with the esbe mixers

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  @markcostello2734Ай бұрын

  @@andrewmillwardwatford9410 Thanks I shall have a delve into your past 😂 but to be fair I’m subscribed and thought I’d watched most of what you’d put out Keep it up great content 👍

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  @brendanfisher2528Ай бұрын

  Hi andrew.. sorry if i sound stupid here. You have 3 pumps running off the close coupled tee. Would they not be fighting against each other? Is it more beneficial with 3 individual pumps on each circuit rather than 1 decent sized pump? Love the videos! Very intresting stuff.

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  @andrewmillwardwatford9410Ай бұрын

  These pumps are after each mixer. You can't place the pump the other side.

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  @normanboyes4983Ай бұрын

  Those two grey plastic pipes on the left with the plastic 90s spoil the look.😉

• 
  @chrisparkin8329Ай бұрын

  Hi Andrew another lovely install! Are those non return valves on all three of the returns?

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  @andrewmillwardwatford9410Ай бұрын

  Yes so much of the Returns to prevent backflow in case of any pump being inactive. Interestingly on the pre-built pumping stations the non-return valve is on the return on the secondary side, I can't see the point in this but on the vaisman schematic it is clearly showing in the position I have placed it in this job. I have on different jobs placed non-return valves in different locations and I'm not sure if I've got this correct every time

• 
  @CommercialGasEngineerVideosАй бұрын

  I've not seen any love a viessmann more than you. Wowser, what a long term relationship. Anniversary must be coming up. Thanks for sharing your work for us to learn and enjoy

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  @andrewmillwardwatford9410Ай бұрын

  I think anyone that has any good understanding of hydraulic design could not fail but to make the choice for Viessmann every time.

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  @CommercialGasEngineerVideosАй бұрын

  @@andrewmillwardwatford9410 ok so it's mainly hydraulic separation that separates viessmann from the competition.

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  @andrewmillwardwatford9410Ай бұрын

  @@CommercialGasEngineerVideos you can use hydraulic separation on many boilers. But the v200 has superiority about every feature on a boiler.

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  @CommercialGasEngineerVideosАй бұрын

  @@andrewmillwardwatford9410 the main exposure I've had with these boilers was years ago when a viessmann evangelist in Watford told me about them. The man would not install anything other than a viessmann. I reckon he has shares in the company and if not should have. Since then I've probably seen no more than 10. I've seen 3-5 in commercial settings. Vitodens 200w recently. I was quite impressed when technical support video called me. Never seen that before. I don't think Andrewmann boilers haven't made much of a breakthrough in the commercial world as yet. Anyways I'm looking forward to hearing how this boiler beats others in hydraulic separation.

• 
  @nigelrogers2474Ай бұрын

  Is the 22mm clearance you mentioned centre to centre even if the pipework is clipped?

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  @andrewmillwardwatford9410Ай бұрын

  The 22 mil clearance is between the pipes not centre to centre

• 
  @Haik0Ай бұрын

  DOes weather comp comes built in or is it a separate module that needs to be installed ?

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  @andrewmillwardwatford9410Ай бұрын

  Unlike the competitors products that require expensive additional controls to be fitted everything on the V2 is included

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  @markfernandes2467Ай бұрын

  @@andrewmillwardwatford9410 V 2 means V 200, so the weather comp doesn't come with the W 100 (Combi)

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  @andrewmillwardwatford9410Ай бұрын

  @@markfernandes2467 it's standard with the v200 and the v100 but you need to order the weather comp sensor as an extra component on the 100. The weather compensation sensor is about £30

• 
  @markfernandes2467Ай бұрын

  @@andrewmillwardwatford9410 Thanks for the answer. :) If you weren't in Watford, I'd try to ask you to fit my boiler, great knowledge in the video. Along with Symon (Urbanplumbers), you two are the best on YT & about the only ones I trust. Getting "heating engineers" around & seeing them sneer when I ask stuff like "can you wire it though open-therm" or other such questions is really making things hard. as if they have that attitude, I have zero confidence in their abilities & they're not going to give any good advice for my install are they? Right now I'm struggling with boiler choice. U & Symon seem to disagree on Viesmann (except W200) For combi I'm thinking Veismann W100 B1KF-30kw or Vaillant EcoTec plus 826 (the new one) this is for a 2 bed 3rd floor (top) flat 72m2 currently 1 bath 16l per min mains flow currently reg boiler fitted with 117 unvented cylinder, heat loss here is maybe 7kw. (self estimated with an online tool) I'm also thinking if I should change the location from Kitchen, to behind a stud partition in the WC (currently dead space) re routing Gas & Mains water to there as I have access to the loft and the flue would be easier on that elevation, as the building has an adjoining flat roof with access under that location at the second-floor level, so my flat is like a 1st floor flat on that elevation only. To the front, it's 3rd & the new flue (needed) can only be fitted from the inside (push-pull & snug) Anyway, on the boiler chioce, which would you go for ? the W100-30 or the 826 "remastered"? If remastered I hear I should always fit Vaillant controlls. Viesmann, not so sure, maybe 3rd party is ok? Would you go weather compesated & what controls?? Any advice would be appreciated Andrew, cheers & keep the vids coming. Hope you do a collab with Symon one day

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  @andrewmillwardwatford9410Ай бұрын

  @@markfernandes2467 where are you based ?

• 
  @Allegedly2rightАй бұрын

  Confusion haha that the word I am after Heat Pumps hide behind confusion.How do you control Flow Rate it is a mechanical valve set and forget pumps have 3 speeds that is not volume litres per minute is a variable depending on outside temperature is it not.Said wee Jimmy at the back of the class.I am passing the time trying to figure it out.Cheers good content can’t keep them all Happy haha.We don’t all have money to throw at it you must have a cheap pump .your installer was crap,your low loss calculations are wrong take your pick they all apply.

• 
  @instalatorklumea1926Ай бұрын

  Hi,Andrew for the heat pump most likely it should be 100 centre ? Thank you

• 
  @andrewmillwardwatford9410Ай бұрын

  Each room in a property will have a different requirement for heat input. We need to establish the correct pipe spacings for each room based on the same flow temperature. This may require 100 ml spacings in one room and 300 ml spacings in another

• 
  @instalatorklumea1926Ай бұрын

  Thank you for everything you do, top man I hope I will meet you again

• 
  @joehaskett90Ай бұрын

  What are the threaded inserts you’ve used in the brickwork for the clips?

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  @andrewmillwardwatford9410Ай бұрын

  These had been used on these particular heat pumps and I had never seen them before. They are like concrete screws. Here we are just reusing them

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  @PETERJONES-tw4ltАй бұрын

  Thanks andrew I've found the equation

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  @PETERJONES-tw4ltАй бұрын

  Andrew how quick is the recovery time compared to using the coil thanks

• 
  @andrewmillwardwatford9410Ай бұрын

  It depends on the size of the cylinder. I need to do some basic videos on this type of maths

• 
  @DanielCurry1979Ай бұрын

  Do heat pumps even work? Every single 1 I’ve seen fitted, the householder has wished they had their gas boiler back.

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  @andrewmillwardwatford9410Ай бұрын

  I think a lot of people have had them poorly installed and those people live in regret. However this is no different to gas boilers that are poorly installed it seems that using a heat geek is a fairly good guarantee of ensuring you get a good installation

• 
  @janeg1685Ай бұрын

  EXACTLY THAT - 20years in contract pipefitting, I all ways saw that virtually on every job - their fee usually 5% of contract price.

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  @normanboyes4983Ай бұрын

  The customer will be really chuffed with this new transplant, much easier to control. Why have you got flow control valves on the cylinders? Does Viessman not have the native capability to control on two cylinders?

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  @andrewmillwardwatford9410Ай бұрын

  The zone valve are required to comply with G3 as the cylinders are not manufactured by v i e s s m a

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  @normanboyes4983Ай бұрын

  Oooo that’s another interesting project. I am surprised they needed to use the boilers - the multiple pumps churning the water up should have been able to heat the place.😉

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  @griffithsheatingАй бұрын

  That’s about 2kw worth of pump power 😅

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  @alexbennett8437Ай бұрын

  What are you using to activate the 2 port valves on the cylinders?

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  @andrewmillwardwatford9410Ай бұрын

  Well originally I thought I was being smart and that by using an emp1 extension that I would get a hot water loading signal. Now I think I was wrong. I'm back on this job in 10 days time so I'm looking for a new strategy

• 
  @alexbennett8437Ай бұрын

  @@andrewmillwardwatford9410 if you have to have the valves then i have a solution for you. What i would do is when the cylinder calls for heat, the valve activates a simple relay which makes the connection on the cylinder sensor. and when the valve is not power the relay reverts to its default position which goes through a resistor which tricks the boiler into thinking the hot water is satisfied.

• 
  @alexbennett8437Ай бұрын

  do you have to have 2 port valves? i normally just wire the cylinder sensor through the overheat stat, so if it ever overheated (which it wont) it would disconnect the sensor which would stop the boiler from firing in hot water mode. heating would still work

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  @andrewmillwardwatford9410Ай бұрын

  @@cliveramsbotty6077 they are. Although at the moment I don't have the correct signal it is passing through the overhead stats. I have temperature control on both cylinders via cylinder sensors but I have linked both hydraulic lead to both boilers so there is some small discrepancy in temperature control. I need to find a solution for this problem in time for my return in 2 weeks time

• 
  @hufartdАй бұрын

  @@alexbennett8437 I’ve done it by wiring the boiler via the overheat stat which just kills everything. Super safety and all that.

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  @CommercialGasEngineerVideosАй бұрын

  Good job Andy, let me quote for the lagging. You the man. Keep up the good work.

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  @ununhaАй бұрын

  Are they 4 pipes heat only boiler? One side for heating and one for hot water?

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  @andrewmillwardwatford9410Ай бұрын

  Yes the boiler has its own diverter valve on the flow side of the boiler

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  @jamesdc1993Ай бұрын

  I saw something like this install the other day on a home renovation channel, 2x70kw boilers for a 300sm solid stone building. I thought it looked overkill, what do you think? kzread.info/dash/bejne/c6ep0tCOgdeahZc.html

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  @waldomeyer-wentzel3583Ай бұрын

  This is more often than not the fault/intention of the M&E specifier. The more complex the design, the higher the value of their bill. They know it's oversized but also know the client hasn't got a clue what the requirements are so they just design away and invoice accordingly. Then we come along and are told to stick the the design and just install what's been specified. Plenty of rogue traders in the supposed professional industry... Thorough video as always Andrew, thank you.

• 
  @leeedwards3783Ай бұрын

  Thanks for the video. I have just installed a Viessmann 100-w and I am going to put weather comp in. It says in the manual that I should adjust it according to the property type but the graphs are quite hard to understand.

• 
  @andrewmillwardwatford9410Ай бұрын

  If you look back through my channel you'll find a video on weather compensation

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  @leeedwards3783Ай бұрын

  Thanks. Will be sure to check it out.

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  @lukecraft1265Ай бұрын

  Very interesting video. The secondary pumps that do this are Magna 3 set to DT control. You need to add a sensor to use this control mode. They are also very useful in more complex systems with plc or ddc control with cim module they play nicely with supervisory control. So you can set limits on low speed / high speed and use DT control in between. Downside is expensive and time consuming to setup!

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  @andrewmillwardwatford9410Ай бұрын

  I fitted one about a year or so ago on DT control. But what we need on heat pumps is to a very the flow according to the cycle. This way we can minimise negative mixing until it is needed to prevent cycling auto charge the buffer prior to defrost

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  @lukecraft1265Ай бұрын

  Sounds like a major simplification and improvement planned. Personally I would want to retain a low loss header as planned with the viessman header but configure system to keep the 3 port mixer for ufh. Fit smaller correctly sized circs.. I would do this so I have redundancy if one boiler fails. So either boiler can provide for any demand. Ufh, rads or dhw. Interesting video, thanks for sharing.

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  @andrewmillwardwatford9410Ай бұрын

  I can't retain this low loss header if I'm going to use it to supply to circuits as it is incorrectly designed for this purpose.

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  @hiltonshaw5528Ай бұрын

  Standard nonsense on most commercial installations

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  @CommercialGasEngineerVideosАй бұрын

  I've seen plant rooms in palaces and can tell you for free that this looks better. Guess they are trying to make money off the material mark up. Go on Andrew, get those robbers b4 it's too late😮

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  @joe90d2Ай бұрын

  They must have shares in pump company 😂

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  @CommercialGasEngineerVideosАй бұрын

  On a serious note, which big company on the stock markets owns or makes pumps. I'd love to know

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  @dannywilkins887Ай бұрын

  That would have been designed by a m&e consultant, they always oversize everything I’ve seen endless times

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  @matthewtrueblood408Ай бұрын

  Totally agree. Most m&e consultants just copy & paste from other tenders. Seen it so many times. But over-engineering & over-specifying also happens domestically. We see a lot of the blue van brigade quoting to putting 30kw heat only boilers when we do a full house heat loss survey that comes to about 16-18kw. Crazy

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  @maxsmith4820Ай бұрын

  I see this sort of thing all the time on heat pump installs on big houses, simplify where possible!

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  @TheProfessional15Ай бұрын

  NO BORDERS NO NATIONS

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  @HarryMasters-hd3pn2 ай бұрын

  I use the Hilti bits, go straight into the brickwork, not back plates

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  @joehaskett902 ай бұрын

  What is the part no. for this from Antares?

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  @andrewmillwardwatford94102 ай бұрын

  I'm sorry I really don't know

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  @stixstonesinvestors54132 ай бұрын

  So nice Andrew. 🔥🔥🔥🔥

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  @aliatas66472 ай бұрын

  Hi Andrew, is there any advantage or disadvantage of forming the CCT in 35mm, followed by 35mm upstream and downstream of CCT, down to 22mm to go through the filter and air separator and connect to boiler? Or just run the whole loop in 22mm?

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  @andrewmillwardwatford94102 ай бұрын

  No need to up size

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  @aliatas66472 ай бұрын

  @@andrewmillwardwatford9410 Thanks Andrew. Are there any rules to follow regarding distances to elbows etc?

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  @andrewmillwardwatford94102 ай бұрын

  @@aliatas6647 sorry I just reply to you thinking I was replying on a Facebook post. Yes there are rules for distances from elbows I think if you Google close coupled Tees you'll find the images you may have to Google closely space Tees

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  @aliatas66472 ай бұрын

  @@andrewmillwardwatford9410 thanks Andrew. Can you feed multiple secondaries of the single CCT from the primary loop? Or do you need to have multiple CCTs feeding each zone separately? I only ask after googling this stuff and would be great to know you're experience of it.

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  @andrewmillwardwatford94102 ай бұрын

  @@aliatas6647 I'm afraid none of your questions have very straightforward simple answers. You can have both but having multiple close couple teas suitable for use with weather compensation so it's not something that I would recommend other than if you're trying to fix an old system has no real weather compensation option