@heacol thanks . I read your recent article on here with great interest, and also your linkedin post about your conference presentation, I'm waiting with bated breath for your full write up. given that you don't use buffers or plates or any form of separation, that implies to me you may have accepted a lower flow rate than that implied by (say) 16kw@DT5 (for a large older house), in which case you may be running a wider DT? I'm also really interested in your detailed thoughts on control. Do you site the heat pump's controller in a location where there is always demand? or am I leaping too far ahead and should just wait for your write up? my system is still a single loop gas boiler right now so I've all these decisions to take.

@hughf thanks, I had been zeroing in on daikin as a likely candidate as those DT settings are indeed there in the manual, and I find it one of the better written manuals. annoying that the new samsung still doesn't have a published set of manuals yet.

I really appreciate the help, any of you guys fancy installing a system in milton keynes? I'm really struggling to find an installer that I'm comfortable to give the work to. Met plenty of "plumbers" who know less about heat engineering than I do (but are far better pipework fitters) and so run away once a conversation about system design is initiated...

PWM pumps, I've been wanting to change my heat-only gas boiler's pump (grundfos alpha2) to a PWM one for ages. at fixed max speed it heats the house but is really noisy , and when demand is low the pipes resonate due to the TRV small openings. in PP3 mode its super quiet but not enough flow for the whole house on a cold day. I do manual PWM by running up there and pressing the button if its below zero...:(. I have the means of generating a PWM control signal based on heating load - evohome radiator heads running into home-assistant through ramses-RF gives me the number for % heat demand for the house (and/or for every single room) which can be mapped to a PWM level, an ESP32 board will do the hardware part - but tracking down a PWM pump (with control cable) in the uk domestic market is proving challenging for me (as far as I can tell the commonly available grundfos UPS3 is PWM capable, but no-one uses or sells the PWM parts in the UK...)

 cheers

Ian

@iancalderbank all you need is a pwm cable. As long as the pump has two sockets on it, it’s pwm capable.

You could even just jam 3 crimp connectors in there if you can’t get a cable.

@iancalderbank PM me and I will see if I can help.

Posted by: @iancalderbank

↑

@heacol thanks . I read your recent article on here with great interest, and also your linkedin post about your conference presentation, I'm waiting with bated breath for your full write up. given that you don't use buffers or plates or any form of separation, that implies to me you may have accepted a lower flow rate than that implied by (say) 16kw@DT5 (for a large older house), in which case you may be running a wider DT? I'm also really interested in your detailed thoughts on control. Do you site the heat pump's controller in a location where there is always demand? or am I leaping too far ahead and should just wait for your write up? my system is still a single loop gas boiler right now so I've all these decisions to take.

@hughf thanks, I had been zeroing in on daikin as a likely candidate as those DT settings are indeed there in the manual, and I find it one of the better written manuals. annoying that the new samsung still doesn't have a published set of manuals yet.

I really appreciate the help, any of you guys fancy installing a system in milton keynes? I'm really struggling to find an installer that I'm comfortable to give the work to. Met plenty of "plumbers" who know less about heat engineering than I do (but are far better pipework fitters) and so run away once a conversation about system design is initiated...

PWM pumps, I've been wanting to change my heat-only gas boiler's pump (grundfos alpha2) to a PWM one for ages. at fixed max speed it heats the house but is really noisy , and when demand is low the pipes resonate due to the TRV small openings. in PP3 mode its super quiet but not enough flow for the whole house on a cold day. I do manual PWM by running up there and pressing the button if its below zero...:(. I have the means of generating a PWM control signal based on heating load - evohome radiator heads running into home-assistant through ramses-RF gives me the number for % heat demand for the house (and/or for every single room) which can be mapped to a PWM level, an ESP32 board will do the hardware part - but tracking down a PWM pump (with control cable) in the uk domestic market is proving challenging for me (as far as I can tell the commonly available grundfos UPS3 is PWM capable, but no-one uses or sells the PWM parts in the UK...)

 cheers

Ian

Just Google 'pwm cable for grundfos pumps' and you will find a selection of suitable cables on offer.

Thanks very much all! Just found the MCS link for the unit sold by Midsummer....link below for anyone else interested.

Product directory - MCS (mcscertified.com)

Gen6 SCOPs:

New HT SCOPS:

@iancalderbank - I'm in a similar position to you in many ways: a (now retired electronics) engineer in Milton Keynes looking to replace a gas boiler in a large unconventional property. The property was built in 1990 but the boiler was subsequently replaced by a BG gas safe trained plumber. Although the system as originally installed appears to have had some weather compensation, that went out of the window along with all idea of a coherent system design. The present boiler is, I believe, over-specified, grossly inefficient and is ageing before it's time (it is ten years old). Now seems to be a good time to consider all replacement options. It's a large system comprising 18 radiators and a complex blend of pipe gauges. I'm not keen on learning another skill myself so I really need to involve a professional heating engineer who knows their onions. Have you been able to identify anyone locally who could fit the bill? I'm happy for you to message privately if you prefer.

Ian

@grahamh any feedback you can share on this samsung you installed?